Overclock.net › Forums › Graphics Cards › AMD/ATI › Active vs. Passive Displayport adapters *the truth*
New Posts  All Forums:Forum Nav:

Active vs. Passive Displayport adapters *the truth*

post #1 of 105
Thread Starter 
There seems to be a ton of confusion around here about 1) what is required for eyefinity, 2) what an active adapter is, and 3) the difference between active and passive adapters. I am making this thread, hopefully to clear that confusion.

1) Eyefinity requires an ACTIVE adapter to enable a third monitor on HD 5000 cards. Passive will NOT work, except for the first two monitors on the eyefinity 5 and eyefinity 6 cards. For the other three/four monitors, active is still required. A quick explanation of why is because DVI/HDMI requires a special clock, which the card is only able to provide two of. Displayport does not use this clock, so ATI used it as a workaround.

2) An active adapter converts a true displayport signal into DVI/HDMI/VGA/whatever else. It will have either a converter chip or a DAC built in to do said conversion. Contrary to popular belief, they do not need to have a usb power connection, in fact there are many that do not.

3) This is the big one I have been seeing a lot lately. The difference between active and passive is simple.
Passive adapters are merely a cable to go from displayport to DVI/HDMI/VGA/w.e. The video card detects the monitor as such, and outputs the required signal (DVI/HDMI/VGA). This does require one of the two aformentioned clocks, hence why they do not work with eyefinity cards.
Active adapters, on the other hand recieve a displayport signal from the video card, and convert it to DVI/HDMI/VGA. They will always have some sort of onboard DAC or video converter chip which they use to convert the dp signal. Lately, most everyone has been referring the DAC ones (which are the converters that go DP->VGA) as 'passive.' This is not the case.

Examples of passive adapters:





Examples of active adapters:


^ The one most commonly in question. There is also a newer version, which has a cable between the plugs. This is sold under several mfg. names.


^ Sapphire active displayport adapter. There are also similar versions sold by Dell and a few other companies.


^Apple mini displayport -> DVI adapter. I highly recommend avoiding this one, because it seems to only work well with apple monitors.



As far as I have seen, most DP->VGA adapters are active. I say 'most' because, while I have not seen a truly passive one, DP is still capable of outputting the signal, so there is a chance it exists.

Now, go forth and spread the word!
lol j/k. The point of this thread was to a) expose the truth (I go into OCD rage mode when I see people claiming that passive adapters work), and b) protect buyers from buying true passive adapters because they heard the DACs work.
 
GhettoBook
(13 items)
 
Pink EEE PC
(6 items)
 
CPUMotherboardGraphicsRAM
258x Omron MY4N relay @ 4 Hz plywood um, blinky lights? 4096 bit core memory 
OSMonitorKeyboardPower
Machine code FTW! 100+ LEDs lots of switches some huge 24V transformer 
CaseAudio
plywood CLICK CLICK CLICK 
CPUMotherboardGraphicsRAM
Q9000 @2.0 GHz HP DV7 2270us Mobility Radeon 4650 4GB DDR3 
Hard DriveOptical DriveOSMonitor
40GB Hitachi DVD-RW drive Debian + W7 Home premium x64 23" AOC panel 
KeyboardPowerCaseMouse
Undecided 500 Whr Lithium ion homemade out of ABS sheet Wacom Bamboo touch 
Mouse Pad
N/A 
CPUGraphicsRAMHard Drive
Atom N270 Intel GMA 1GB DDR2 160GB 
OSMonitor
Ubuntu 12.04 10.1 inch 1024x600 lcd 
  hide details  
Reply
 
GhettoBook
(13 items)
 
Pink EEE PC
(6 items)
 
CPUMotherboardGraphicsRAM
258x Omron MY4N relay @ 4 Hz plywood um, blinky lights? 4096 bit core memory 
OSMonitorKeyboardPower
Machine code FTW! 100+ LEDs lots of switches some huge 24V transformer 
CaseAudio
plywood CLICK CLICK CLICK 
CPUMotherboardGraphicsRAM
Q9000 @2.0 GHz HP DV7 2270us Mobility Radeon 4650 4GB DDR3 
Hard DriveOptical DriveOSMonitor
40GB Hitachi DVD-RW drive Debian + W7 Home premium x64 23" AOC panel 
KeyboardPowerCaseMouse
Undecided 500 Whr Lithium ion homemade out of ABS sheet Wacom Bamboo touch 
Mouse Pad
N/A 
CPUGraphicsRAMHard Drive
Atom N270 Intel GMA 1GB DDR2 160GB 
OSMonitor
Ubuntu 12.04 10.1 inch 1024x600 lcd 
  hide details  
Reply
post #2 of 105
so..... how do you explain ALL of the people claiming they got eyefinity to work using a passive DP to VGA adaptor? They are lying perhaps? Can't be 12,600 people all lying just to sell passive DP adaptors can there?

Not jumping on you or anything like that. I'm trying to get an eyefinity setup going myself and the amount of hoops you have to jump through are amazing.
Edited by Roxxas049 - 4/29/10 at 2:48pm
post #3 of 105
Quote:
Originally Posted by foothead View Post
Examples of active adapters:


^ The one most commonly in question. There is also a newer version, which has a cable between the plugs. This is sold under several mfg. names.
Do you have some proof of that? I'm pretty sure its passive. I don't think its possible to produce an active adapter for a tenner.
Dethkomp
(28 items)
 
  
CPUMotherboardGraphicsRAM
4670k @ 4.5Ghz 1.26v Asus Z87 Pro Vtx3d 7950 X-Edition XFire G-Skill 16gb DDR3 2400Mhz 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 830 256gb Samsung 840 Evo 6.5tb storage Samsung DVD Burner 
CoolingOSOSMonitor
Corsair H110 Windows 8 Ultimate 64bit Ubuntu 13.04 3x Potalion 27" 1440p 
MonitorKeyboardPowerCase
Oculus Rift Dev Kit Logitech G710+ Super Flower 1000w Platinum HAF X 
MouseMouse PadAudioAudio
CM Storm Spawn Steelseries Experience I-2 Creative Sound Blaster Titanium X-Fi (Heavily m... Yamaha RX-V667 receiver 
AudioAudioAudioAudio
Monitor Audio BX2 5.1 Sennheiser RS220 Audio Technica ATM-M50 Samson Meteor Mic 
OtherOtherOtherOther
Humanscale Freedom chair MSFFB2+X52 modded flightstick Saitek Pro Flight Rudder Pedals Track IR 5 
  hide details  
Reply
Dethkomp
(28 items)
 
  
CPUMotherboardGraphicsRAM
4670k @ 4.5Ghz 1.26v Asus Z87 Pro Vtx3d 7950 X-Edition XFire G-Skill 16gb DDR3 2400Mhz 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 830 256gb Samsung 840 Evo 6.5tb storage Samsung DVD Burner 
CoolingOSOSMonitor
Corsair H110 Windows 8 Ultimate 64bit Ubuntu 13.04 3x Potalion 27" 1440p 
MonitorKeyboardPowerCase
Oculus Rift Dev Kit Logitech G710+ Super Flower 1000w Platinum HAF X 
MouseMouse PadAudioAudio
CM Storm Spawn Steelseries Experience I-2 Creative Sound Blaster Titanium X-Fi (Heavily m... Yamaha RX-V667 receiver 
AudioAudioAudioAudio
Monitor Audio BX2 5.1 Sennheiser RS220 Audio Technica ATM-M50 Samson Meteor Mic 
OtherOtherOtherOther
Humanscale Freedom chair MSFFB2+X52 modded flightstick Saitek Pro Flight Rudder Pedals Track IR 5 
  hide details  
Reply
post #4 of 105
Thread Starter 
The people claiming they use passive adapters are not truly using passive adapters. They have a DAC in them. It is just misinformation.

I can take mine apart later and post a picture of said DAC if you need.
 
GhettoBook
(13 items)
 
Pink EEE PC
(6 items)
 
CPUMotherboardGraphicsRAM
258x Omron MY4N relay @ 4 Hz plywood um, blinky lights? 4096 bit core memory 
OSMonitorKeyboardPower
Machine code FTW! 100+ LEDs lots of switches some huge 24V transformer 
CaseAudio
plywood CLICK CLICK CLICK 
CPUMotherboardGraphicsRAM
Q9000 @2.0 GHz HP DV7 2270us Mobility Radeon 4650 4GB DDR3 
Hard DriveOptical DriveOSMonitor
40GB Hitachi DVD-RW drive Debian + W7 Home premium x64 23" AOC panel 
KeyboardPowerCaseMouse
Undecided 500 Whr Lithium ion homemade out of ABS sheet Wacom Bamboo touch 
Mouse Pad
N/A 
CPUGraphicsRAMHard Drive
Atom N270 Intel GMA 1GB DDR2 160GB 
OSMonitor
Ubuntu 12.04 10.1 inch 1024x600 lcd 
  hide details  
Reply
 
GhettoBook
(13 items)
 
Pink EEE PC
(6 items)
 
CPUMotherboardGraphicsRAM
258x Omron MY4N relay @ 4 Hz plywood um, blinky lights? 4096 bit core memory 
OSMonitorKeyboardPower
Machine code FTW! 100+ LEDs lots of switches some huge 24V transformer 
CaseAudio
plywood CLICK CLICK CLICK 
CPUMotherboardGraphicsRAM
Q9000 @2.0 GHz HP DV7 2270us Mobility Radeon 4650 4GB DDR3 
Hard DriveOptical DriveOSMonitor
40GB Hitachi DVD-RW drive Debian + W7 Home premium x64 23" AOC panel 
KeyboardPowerCaseMouse
Undecided 500 Whr Lithium ion homemade out of ABS sheet Wacom Bamboo touch 
Mouse Pad
N/A 
CPUGraphicsRAMHard Drive
Atom N270 Intel GMA 1GB DDR2 160GB 
OSMonitor
Ubuntu 12.04 10.1 inch 1024x600 lcd 
  hide details  
Reply
post #5 of 105
Quote:
Originally Posted by Roxxas049 View Post
so..... how do you explain ALL of the people claiming they got eyefinity to work using a passive DP to VGA adaptor? They are lying perhaps? Can't be 12,600 people all lying just to sell passive DP adaptors can there?

Not jumping on you or anything like that. I'm trying to get an eyefinity setup going myself and the amount of hoops you have to jump through are amazing.
Quote:
Originally Posted by Tehrawk View Post
Do you have some proof of that? I'm pretty sure its passive. I don't think its possible to produce an active adapter for a tenner.
Quote:
Originally Posted by foothead View Post
The people claiming they use passive adapters are not truly using passive adapters. They have a DAC in them. It is just misinformation.

I can take mine apart later and post a picture of said DAC if you need.
Guys...

DP is a digital signal

VGA is an analog signal.

Conversion MUST happen, somewhere.

Just because misinformed, and some dim people, call it a passive adaptor, doesn't mean it is.

It is still actively converting the Digital DP signal, over to an Analog VGA signal.

You cannot passively convert that (not for DP to VGA).
Longshot r4.1
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k Maximus IV GENE-Z eVGA GTX780 Ti 3GB Sniper 8GB 1600 1.25V 
Hard DriveOptical DriveOSMonitor
C300 128GB + 2*WD Green 2TB LG Blu-ray RW external Windows 7 HP64 U2711 
KeyboardPowerCaseMouse
Ducky Shine 3 AX850 FT03b Logitech G9x 
Mouse Pad
Bubbles Pad 
  hide details  
Reply
Longshot r4.1
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k Maximus IV GENE-Z eVGA GTX780 Ti 3GB Sniper 8GB 1600 1.25V 
Hard DriveOptical DriveOSMonitor
C300 128GB + 2*WD Green 2TB LG Blu-ray RW external Windows 7 HP64 U2711 
KeyboardPowerCaseMouse
Ducky Shine 3 AX850 FT03b Logitech G9x 
Mouse Pad
Bubbles Pad 
  hide details  
Reply
post #6 of 105
Thread Starter 
Quote:
Originally Posted by ablearcher View Post
Guys...

DP is a digital signal

VGA is an analog signal.

Conversion MUST happen, somewhere.

Just because misinformed, and some dim people, call it a passive adaptor, doesn't mean it is.

It is still actively converting the Digital DP signal, over to an Analog VGA signal.

You cannot passively convert that (not for DP to VGA).


Actually you can, because there is no conversion going on with a passive adapter. Instead, the card outputs the intended signal.
 
GhettoBook
(13 items)
 
Pink EEE PC
(6 items)
 
CPUMotherboardGraphicsRAM
258x Omron MY4N relay @ 4 Hz plywood um, blinky lights? 4096 bit core memory 
OSMonitorKeyboardPower
Machine code FTW! 100+ LEDs lots of switches some huge 24V transformer 
CaseAudio
plywood CLICK CLICK CLICK 
CPUMotherboardGraphicsRAM
Q9000 @2.0 GHz HP DV7 2270us Mobility Radeon 4650 4GB DDR3 
Hard DriveOptical DriveOSMonitor
40GB Hitachi DVD-RW drive Debian + W7 Home premium x64 23" AOC panel 
KeyboardPowerCaseMouse
Undecided 500 Whr Lithium ion homemade out of ABS sheet Wacom Bamboo touch 
Mouse Pad
N/A 
CPUGraphicsRAMHard Drive
Atom N270 Intel GMA 1GB DDR2 160GB 
OSMonitor
Ubuntu 12.04 10.1 inch 1024x600 lcd 
  hide details  
Reply
 
GhettoBook
(13 items)
 
Pink EEE PC
(6 items)
 
CPUMotherboardGraphicsRAM
258x Omron MY4N relay @ 4 Hz plywood um, blinky lights? 4096 bit core memory 
OSMonitorKeyboardPower
Machine code FTW! 100+ LEDs lots of switches some huge 24V transformer 
CaseAudio
plywood CLICK CLICK CLICK 
CPUMotherboardGraphicsRAM
Q9000 @2.0 GHz HP DV7 2270us Mobility Radeon 4650 4GB DDR3 
Hard DriveOptical DriveOSMonitor
40GB Hitachi DVD-RW drive Debian + W7 Home premium x64 23" AOC panel 
KeyboardPowerCaseMouse
Undecided 500 Whr Lithium ion homemade out of ABS sheet Wacom Bamboo touch 
Mouse Pad
N/A 
CPUGraphicsRAMHard Drive
Atom N270 Intel GMA 1GB DDR2 160GB 
OSMonitor
Ubuntu 12.04 10.1 inch 1024x600 lcd 
  hide details  
Reply
post #7 of 105
Quote:
Originally Posted by foothead View Post
Actually you can, because there is no conversion going on with a passive adapter. Instead, the card outputs the intended signal.
then how come I couldn't use:

DVI
HDMI
DVI--> VGA

?

As I understand the DVI port has 5 pins on the side for analog VGA...
Longshot r4.1
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k Maximus IV GENE-Z eVGA GTX780 Ti 3GB Sniper 8GB 1600 1.25V 
Hard DriveOptical DriveOSMonitor
C300 128GB + 2*WD Green 2TB LG Blu-ray RW external Windows 7 HP64 U2711 
KeyboardPowerCaseMouse
Ducky Shine 3 AX850 FT03b Logitech G9x 
Mouse Pad
Bubbles Pad 
  hide details  
Reply
Longshot r4.1
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k Maximus IV GENE-Z eVGA GTX780 Ti 3GB Sniper 8GB 1600 1.25V 
Hard DriveOptical DriveOSMonitor
C300 128GB + 2*WD Green 2TB LG Blu-ray RW external Windows 7 HP64 U2711 
KeyboardPowerCaseMouse
Ducky Shine 3 AX850 FT03b Logitech G9x 
Mouse Pad
Bubbles Pad 
  hide details  
Reply
post #8 of 105
Thread Starter 
Sorry, i do not follow. Do you mean why you could not use tge three together?

VGA needs the same clock as DVI. This would be why.

My point was that the passive converter simply tells the card to output the signal in dvi, vga, or w/e. It still would need the clock, hance why it is not compatible with eyefinity. My point was that, assuming the clock was available, it would be able to output an analog signal.
 
GhettoBook
(13 items)
 
Pink EEE PC
(6 items)
 
CPUMotherboardGraphicsRAM
258x Omron MY4N relay @ 4 Hz plywood um, blinky lights? 4096 bit core memory 
OSMonitorKeyboardPower
Machine code FTW! 100+ LEDs lots of switches some huge 24V transformer 
CaseAudio
plywood CLICK CLICK CLICK 
CPUMotherboardGraphicsRAM
Q9000 @2.0 GHz HP DV7 2270us Mobility Radeon 4650 4GB DDR3 
Hard DriveOptical DriveOSMonitor
40GB Hitachi DVD-RW drive Debian + W7 Home premium x64 23" AOC panel 
KeyboardPowerCaseMouse
Undecided 500 Whr Lithium ion homemade out of ABS sheet Wacom Bamboo touch 
Mouse Pad
N/A 
CPUGraphicsRAMHard Drive
Atom N270 Intel GMA 1GB DDR2 160GB 
OSMonitor
Ubuntu 12.04 10.1 inch 1024x600 lcd 
  hide details  
Reply
 
GhettoBook
(13 items)
 
Pink EEE PC
(6 items)
 
CPUMotherboardGraphicsRAM
258x Omron MY4N relay @ 4 Hz plywood um, blinky lights? 4096 bit core memory 
OSMonitorKeyboardPower
Machine code FTW! 100+ LEDs lots of switches some huge 24V transformer 
CaseAudio
plywood CLICK CLICK CLICK 
CPUMotherboardGraphicsRAM
Q9000 @2.0 GHz HP DV7 2270us Mobility Radeon 4650 4GB DDR3 
Hard DriveOptical DriveOSMonitor
40GB Hitachi DVD-RW drive Debian + W7 Home premium x64 23" AOC panel 
KeyboardPowerCaseMouse
Undecided 500 Whr Lithium ion homemade out of ABS sheet Wacom Bamboo touch 
Mouse Pad
N/A 
CPUGraphicsRAMHard Drive
Atom N270 Intel GMA 1GB DDR2 160GB 
OSMonitor
Ubuntu 12.04 10.1 inch 1024x600 lcd 
  hide details  
Reply
post #9 of 105
funny the one i have says neather passive or active lol just that its a dp to vga and it works thats all that matters lol

http://www.newegg.com/Product/Produc...82E16812270275

"Model
BrandBYTECC
ModelAP-DPVGA
Spec
TypeDisplayPort to VGA
Features
FeaturesDisplayPort v1.1 Compliant

Enable high quality optional digital audio transmissions

embedded clock architecture to reduce EMI susceptibility

Support greater than QXGA (2048x1536) resolution at 24-bit color depths

Support existing VESA and CEA standards

Support hot plug and unplug detection as well as link status-failure detection

Support reduced bandwidth transmission via direct drive over a 15M cable

Supports a minimum of 1080P resolution at 24bpp, 50/60Hz at 15 M

Support conversion from DisplayPort signal to VGA signal

Support DisplayPort connector 20pins

Support 8-bit & 10-bit deep color

Support the video bandwidth up to 10.8Gbps

Support the 1Mbps' bidirectional auxiliary channel

Support the 1 lane, 1 direction, 4 lines connection"
    
CPUMotherboardGraphicsRAM
Intel Core i7 3930k SB-E GIGABYTE GA-X79-UD3 SAPPHIRE FleX 100314FLEX Radeon HD 6870 1GB G-Skill Ripjaw DDR3 1600 
Hard DriveOptical DriveCoolingOS
SAMSUNG 830 Series 128GB + 320gb samsung spinpo... LG* Super Multi 12x Blu-ray Disc Rewriter Corsair H100 Windows 8 PRO 
MonitorKeyboardPowerCase
BenQ GW2450 24" x3 Das Keyboard Silverstone Strider Plus 850 watt Corsair Special Edition White Graphite Series 600T 
MouseMouse PadAudio
Logitech G500 Xtrac pad ripper Creative Labs xfi Titanium Fatal1ty champion + ... 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel Core i7 3930k SB-E GIGABYTE GA-X79-UD3 SAPPHIRE FleX 100314FLEX Radeon HD 6870 1GB G-Skill Ripjaw DDR3 1600 
Hard DriveOptical DriveCoolingOS
SAMSUNG 830 Series 128GB + 320gb samsung spinpo... LG* Super Multi 12x Blu-ray Disc Rewriter Corsair H100 Windows 8 PRO 
MonitorKeyboardPowerCase
BenQ GW2450 24" x3 Das Keyboard Silverstone Strider Plus 850 watt Corsair Special Edition White Graphite Series 600T 
MouseMouse PadAudio
Logitech G500 Xtrac pad ripper Creative Labs xfi Titanium Fatal1ty champion + ... 
  hide details  
Reply
post #10 of 105
Hi,

I got HD5750, the BYTECC 3 ft Mini DisplayPort Male to DisplayPort Male Video Cable Model DPR-03
http://www.newegg.ca/Product/Product...tent-_-text-_-

connected it to iMAC27".

Does not work: It probably gets the signal, because it goes dark for ~20sec while my PC with the Sapphire flickers during this time. Then everything return back to default.

I contacted the support from Sapphire and they suggest i need an active display port adapter which I can't understand, as all I am doing is sending a signal from displayport (HD5750) to mini displayport (iMAC27).

What do you think and recommend to solve the problem?

Thank you!
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD/ATI
Overclock.net › Forums › Graphics Cards › AMD/ATI › Active vs. Passive Displayport adapters *the truth*