Overclock.net › Forums › Components › Power Supplies › Possible PSU and graphics card incompatibility?
New Posts  All Forums:Forum Nav:

Possible PSU and graphics card incompatibility?

post #1 of 7
Thread Starter 
I'll spare you the boring details and condense this into a list of things I did.

1. Installed graphics card HD3850 in computer that's running a Seasonic Snow Silent 750W and there was no display. The card seemed broken.

2. Installed graphics card HD3850 in different computer that's running a PC Power and Cooling 500W and the card runs perfectly. I even benched it with a few programs without incident.

3. Put the HD3850 back in the computer running the 750W PSU and it wasn't working again. So I reset the BIOS and it still didn't work.

4. Reinstalled the HD3850 in the computer running the 500W PSU and it worked great again.

5. I removed the 750W power supply and installed the 500W in it's place; and now the HD3850 runs great in the computer that it wouldn't work in before.

Here is the problem. I checked the voltage of both PSUs. The 500W has 11.9V on the 8 pin PCI-E connector and I verified the pinout. The 750W has 12.1V on the 8 pin PCI-E connector, I verified the pinout and I tried the spare PCI-E wires and different plug locations on the PSU. I still can't get the HD3850 to work with the 750W PSU but it seems to test good and has never shown any problems. I don't have any other card that requires an 8 pin PCI-E; but I planned on a new build this summer using the 750W PSU. I don't want to try to RMA this PSU if there is nothing wrong with it. Is this just an incompatibility?
Sleeper
(31 items)
 
  
CPUMotherboardGraphicsRAM
P4 Northwood SL6PG Dimension 8100 HIS AGP HD4670 Samsung RDRAM (D die) {2GB} 
Hard DriveHard DriveOptical DriveOptical Drive
Seagate 7200.9 Seagate 7200.10 Samsung SH182M Yamaha CRW-F1e 
CoolingCoolingCoolingCooling
Scythe KM01 Scythe Katana III S-Flex 92mm 2500rpm x2 Kaze Jyu Slim 100mm 2000rpm 
CoolingCoolingOSMonitor
Scythe 40mmx10mm Antec Spotcool XP Home Dell M781s 
KeyboardPowerCaseMouse
Dell QuietKey Silencer MKII 750W Dell Dimension 8100 (Modified) Intellimouse Optical 
AudioAudioOtherOther
Turtle Beach Santa Cruz Altec Lansing 251 Vantec 18" round EIDE cable Belkin PCI 5 port USB 2.0 
OtherOtherOtherOther
Belkin 4 port Hub USB 2.0 Logitech MOMO Racing Force Feedback Logitech Wingman Cordless RumblePad Saitek P2500 Rumble Force 
OtherOther
Hewlett Packard 4400C Flatbed Scanner Hewlett Packard CP1525NW Laser Jet Pro 
  hide details  
Reply
Sleeper
(31 items)
 
  
CPUMotherboardGraphicsRAM
P4 Northwood SL6PG Dimension 8100 HIS AGP HD4670 Samsung RDRAM (D die) {2GB} 
Hard DriveHard DriveOptical DriveOptical Drive
Seagate 7200.9 Seagate 7200.10 Samsung SH182M Yamaha CRW-F1e 
CoolingCoolingCoolingCooling
Scythe KM01 Scythe Katana III S-Flex 92mm 2500rpm x2 Kaze Jyu Slim 100mm 2000rpm 
CoolingCoolingOSMonitor
Scythe 40mmx10mm Antec Spotcool XP Home Dell M781s 
KeyboardPowerCaseMouse
Dell QuietKey Silencer MKII 750W Dell Dimension 8100 (Modified) Intellimouse Optical 
AudioAudioOtherOther
Turtle Beach Santa Cruz Altec Lansing 251 Vantec 18" round EIDE cable Belkin PCI 5 port USB 2.0 
OtherOtherOtherOther
Belkin 4 port Hub USB 2.0 Logitech MOMO Racing Force Feedback Logitech Wingman Cordless RumblePad Saitek P2500 Rumble Force 
OtherOther
Hewlett Packard 4400C Flatbed Scanner Hewlett Packard CP1525NW Laser Jet Pro 
  hide details  
Reply
post #2 of 7
Have you tried taking the PCIe cord from the 500W and putting it onto the 750W? Unless of course one of them isn't modular.
It sounds like a bad cable to me. I've never heard of a PSU and component not working together in this sense.

I would try a different cord. Just sounds like something isn't connected somewhere in your PCIe cord.
i7 Rig
(13 items)
 
New Gaming
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7 920 D0 @ 3.8GHz (watercooled) Evga x58 e758 (with Enzotech block) 2x EVGA GTX 275 1792mb 6GB Corsair Dominator (1600) 
Hard DriveOptical DriveOSMonitor
3x 640GB WD Black 2x Samsungs Windows 7 Home Premium 3x 21.5" ASUS, 1x 19" HP 
KeyboardPowerCaseMouse
Logitech G19 Corsair HX1000 Cooler Master HAF 932 Logitech G5 
Mouse Pad
Razer Goliathus Control 
  hide details  
Reply
i7 Rig
(13 items)
 
New Gaming
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7 920 D0 @ 3.8GHz (watercooled) Evga x58 e758 (with Enzotech block) 2x EVGA GTX 275 1792mb 6GB Corsair Dominator (1600) 
Hard DriveOptical DriveOSMonitor
3x 640GB WD Black 2x Samsungs Windows 7 Home Premium 3x 21.5" ASUS, 1x 19" HP 
KeyboardPowerCaseMouse
Logitech G19 Corsair HX1000 Cooler Master HAF 932 Logitech G5 
Mouse Pad
Razer Goliathus Control 
  hide details  
Reply
post #3 of 7
Thread Starter 
The 500W isn't modular. I tried all the PCI-E cables that came with the 750W. I even tried multiple PCI-E sockets on the PSU. I'm wondering if the HD3850 doesn't like the extra .1V - .2V over 12 volts that the 750W is putting out. I may have to wait till I start a build this summer to find out if the 750W is bad; and won't run anything PCI-E (I only have the HD3850 to test it for now).
Sleeper
(31 items)
 
  
CPUMotherboardGraphicsRAM
P4 Northwood SL6PG Dimension 8100 HIS AGP HD4670 Samsung RDRAM (D die) {2GB} 
Hard DriveHard DriveOptical DriveOptical Drive
Seagate 7200.9 Seagate 7200.10 Samsung SH182M Yamaha CRW-F1e 
CoolingCoolingCoolingCooling
Scythe KM01 Scythe Katana III S-Flex 92mm 2500rpm x2 Kaze Jyu Slim 100mm 2000rpm 
CoolingCoolingOSMonitor
Scythe 40mmx10mm Antec Spotcool XP Home Dell M781s 
KeyboardPowerCaseMouse
Dell QuietKey Silencer MKII 750W Dell Dimension 8100 (Modified) Intellimouse Optical 
AudioAudioOtherOther
Turtle Beach Santa Cruz Altec Lansing 251 Vantec 18" round EIDE cable Belkin PCI 5 port USB 2.0 
OtherOtherOtherOther
Belkin 4 port Hub USB 2.0 Logitech MOMO Racing Force Feedback Logitech Wingman Cordless RumblePad Saitek P2500 Rumble Force 
OtherOther
Hewlett Packard 4400C Flatbed Scanner Hewlett Packard CP1525NW Laser Jet Pro 
  hide details  
Reply
Sleeper
(31 items)
 
  
CPUMotherboardGraphicsRAM
P4 Northwood SL6PG Dimension 8100 HIS AGP HD4670 Samsung RDRAM (D die) {2GB} 
Hard DriveHard DriveOptical DriveOptical Drive
Seagate 7200.9 Seagate 7200.10 Samsung SH182M Yamaha CRW-F1e 
CoolingCoolingCoolingCooling
Scythe KM01 Scythe Katana III S-Flex 92mm 2500rpm x2 Kaze Jyu Slim 100mm 2000rpm 
CoolingCoolingOSMonitor
Scythe 40mmx10mm Antec Spotcool XP Home Dell M781s 
KeyboardPowerCaseMouse
Dell QuietKey Silencer MKII 750W Dell Dimension 8100 (Modified) Intellimouse Optical 
AudioAudioOtherOther
Turtle Beach Santa Cruz Altec Lansing 251 Vantec 18" round EIDE cable Belkin PCI 5 port USB 2.0 
OtherOtherOtherOther
Belkin 4 port Hub USB 2.0 Logitech MOMO Racing Force Feedback Logitech Wingman Cordless RumblePad Saitek P2500 Rumble Force 
OtherOther
Hewlett Packard 4400C Flatbed Scanner Hewlett Packard CP1525NW Laser Jet Pro 
  hide details  
Reply
post #4 of 7
How did you check the voltages? hope you used a digtal multi meter and not software.
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Dali Opticon Vokal x2 Dali Opticon 2 x2 Dali Opticon 1 
AudioOtherOther
Dali E12 F Subwoofer CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Dali Opticon Vokal x2 Dali Opticon 2 x2 Dali Opticon 1 
AudioOtherOther
Dali E12 F Subwoofer CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #5 of 7
Thread Starter 
Yes, used a multimeter. Tested at the end of the wire. As I said before, I checked the voltage as well as verified the pinout.
I think the Snow Silent 750W is a single rail; so if there is a problem, then no sockets would work correctly (I assume).
I'm also assuming that the HD3850 is in perfect working order since it runs on the PC Power and Cooling 500W just fine.

I don't like doing RMA (costing the company money) unless I'm certain there is a problem.

Thanks for the responses so far.
Sleeper
(31 items)
 
  
CPUMotherboardGraphicsRAM
P4 Northwood SL6PG Dimension 8100 HIS AGP HD4670 Samsung RDRAM (D die) {2GB} 
Hard DriveHard DriveOptical DriveOptical Drive
Seagate 7200.9 Seagate 7200.10 Samsung SH182M Yamaha CRW-F1e 
CoolingCoolingCoolingCooling
Scythe KM01 Scythe Katana III S-Flex 92mm 2500rpm x2 Kaze Jyu Slim 100mm 2000rpm 
CoolingCoolingOSMonitor
Scythe 40mmx10mm Antec Spotcool XP Home Dell M781s 
KeyboardPowerCaseMouse
Dell QuietKey Silencer MKII 750W Dell Dimension 8100 (Modified) Intellimouse Optical 
AudioAudioOtherOther
Turtle Beach Santa Cruz Altec Lansing 251 Vantec 18" round EIDE cable Belkin PCI 5 port USB 2.0 
OtherOtherOtherOther
Belkin 4 port Hub USB 2.0 Logitech MOMO Racing Force Feedback Logitech Wingman Cordless RumblePad Saitek P2500 Rumble Force 
OtherOther
Hewlett Packard 4400C Flatbed Scanner Hewlett Packard CP1525NW Laser Jet Pro 
  hide details  
Reply
Sleeper
(31 items)
 
  
CPUMotherboardGraphicsRAM
P4 Northwood SL6PG Dimension 8100 HIS AGP HD4670 Samsung RDRAM (D die) {2GB} 
Hard DriveHard DriveOptical DriveOptical Drive
Seagate 7200.9 Seagate 7200.10 Samsung SH182M Yamaha CRW-F1e 
CoolingCoolingCoolingCooling
Scythe KM01 Scythe Katana III S-Flex 92mm 2500rpm x2 Kaze Jyu Slim 100mm 2000rpm 
CoolingCoolingOSMonitor
Scythe 40mmx10mm Antec Spotcool XP Home Dell M781s 
KeyboardPowerCaseMouse
Dell QuietKey Silencer MKII 750W Dell Dimension 8100 (Modified) Intellimouse Optical 
AudioAudioOtherOther
Turtle Beach Santa Cruz Altec Lansing 251 Vantec 18" round EIDE cable Belkin PCI 5 port USB 2.0 
OtherOtherOtherOther
Belkin 4 port Hub USB 2.0 Logitech MOMO Racing Force Feedback Logitech Wingman Cordless RumblePad Saitek P2500 Rumble Force 
OtherOther
Hewlett Packard 4400C Flatbed Scanner Hewlett Packard CP1525NW Laser Jet Pro 
  hide details  
Reply
post #6 of 7
Quote:
Originally Posted by GUnit View Post

Yes, used a multimeter. Tested at the end of the wire. As I said before, I checked the voltage as well as verified the pinout.
I think the Snow Silent 750W is a single rail; so if there is a problem, then no sockets would work correctly (I assume).
I'm also assuming that the HD3850 is in perfect working order since it runs on the PC Power and Cooling 500W just fine.

I don't like doing RMA (costing the company money) unless I'm certain there is a problem.

Thanks for the responses so far.
Seasonic units are not single rail despite that fact they are branded and sold as such.
They are in fact multi rail units.
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Dali Opticon Vokal x2 Dali Opticon 2 x2 Dali Opticon 1 
AudioOtherOther
Dali E12 F Subwoofer CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Dali Opticon Vokal x2 Dali Opticon 2 x2 Dali Opticon 1 
AudioOtherOther
Dali E12 F Subwoofer CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #7 of 7
Thread Starter 
I meant to update this sooner. I didn't want to leave this without some sort of ending.

I did get a couple more graphics cards that require PCIE power. They both work with the Seasonic 750W; so there's nothing wrong with it.
Really weird that the HD3850 will only work when connected to the 500W Seasonic, regardless which motherboard is used. I guess they're soulmates. wink.gif

The moral of the story is: If you have a graphics card that should be good, but isn't working; try a different power supply.
Sleeper
(31 items)
 
  
CPUMotherboardGraphicsRAM
P4 Northwood SL6PG Dimension 8100 HIS AGP HD4670 Samsung RDRAM (D die) {2GB} 
Hard DriveHard DriveOptical DriveOptical Drive
Seagate 7200.9 Seagate 7200.10 Samsung SH182M Yamaha CRW-F1e 
CoolingCoolingCoolingCooling
Scythe KM01 Scythe Katana III S-Flex 92mm 2500rpm x2 Kaze Jyu Slim 100mm 2000rpm 
CoolingCoolingOSMonitor
Scythe 40mmx10mm Antec Spotcool XP Home Dell M781s 
KeyboardPowerCaseMouse
Dell QuietKey Silencer MKII 750W Dell Dimension 8100 (Modified) Intellimouse Optical 
AudioAudioOtherOther
Turtle Beach Santa Cruz Altec Lansing 251 Vantec 18" round EIDE cable Belkin PCI 5 port USB 2.0 
OtherOtherOtherOther
Belkin 4 port Hub USB 2.0 Logitech MOMO Racing Force Feedback Logitech Wingman Cordless RumblePad Saitek P2500 Rumble Force 
OtherOther
Hewlett Packard 4400C Flatbed Scanner Hewlett Packard CP1525NW Laser Jet Pro 
  hide details  
Reply
Sleeper
(31 items)
 
  
CPUMotherboardGraphicsRAM
P4 Northwood SL6PG Dimension 8100 HIS AGP HD4670 Samsung RDRAM (D die) {2GB} 
Hard DriveHard DriveOptical DriveOptical Drive
Seagate 7200.9 Seagate 7200.10 Samsung SH182M Yamaha CRW-F1e 
CoolingCoolingCoolingCooling
Scythe KM01 Scythe Katana III S-Flex 92mm 2500rpm x2 Kaze Jyu Slim 100mm 2000rpm 
CoolingCoolingOSMonitor
Scythe 40mmx10mm Antec Spotcool XP Home Dell M781s 
KeyboardPowerCaseMouse
Dell QuietKey Silencer MKII 750W Dell Dimension 8100 (Modified) Intellimouse Optical 
AudioAudioOtherOther
Turtle Beach Santa Cruz Altec Lansing 251 Vantec 18" round EIDE cable Belkin PCI 5 port USB 2.0 
OtherOtherOtherOther
Belkin 4 port Hub USB 2.0 Logitech MOMO Racing Force Feedback Logitech Wingman Cordless RumblePad Saitek P2500 Rumble Force 
OtherOther
Hewlett Packard 4400C Flatbed Scanner Hewlett Packard CP1525NW Laser Jet Pro 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › Possible PSU and graphics card incompatibility?