Overclock.net › Forums › Graphics Cards › AMD/ATI › HD 7850 performance decrease while increasing memory clock..
New Posts  All Forums:Forum Nav:

HD 7850 performance decrease while increasing memory clock.. - Page 2

post #11 of 29
Thread Starter 
It was never about overclocking high.. It's about noticable performance decrease by the slightest of change in stock memory clock.Kindly read the main thread before replying.
PC
(16 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570k ASRock Z77 Extreme4 Sapphire HD 7970 OC with boost G.SKILL TridentX 2400 Mhz - CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 pro Western Digital Cavier Blue ASUS DVD-R/DVD-RW drive Cooler Master Hyper 212X 
OSMonitorKeyboardPower
Windows 7 Ultimate Edition 64-bit  Samsung S24F350FHW G.Skill RIPJAWS KM570 MX Cooler Master V550 – semi-modular 
CaseMouseAudioAudio
CM 690 III Logitech G102 Prodigy Realtek ALC 898 Sennheiser HD 558 
  hide details  
Reply
PC
(16 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570k ASRock Z77 Extreme4 Sapphire HD 7970 OC with boost G.SKILL TridentX 2400 Mhz - CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 pro Western Digital Cavier Blue ASUS DVD-R/DVD-RW drive Cooler Master Hyper 212X 
OSMonitorKeyboardPower
Windows 7 Ultimate Edition 64-bit  Samsung S24F350FHW G.Skill RIPJAWS KM570 MX Cooler Master V550 – semi-modular 
CaseMouseAudioAudio
CM 690 III Logitech G102 Prodigy Realtek ALC 898 Sennheiser HD 558 
  hide details  
Reply
post #12 of 29
Sorry my bad, I think its your drivers then. Which driver version are on?
post #13 of 29
bandwith is 384 so if you stick it close to that multiple you ll see those number are the uber setting i bet(768 instead of 850 ,1152 instead of 1250 for exemple!(but only in very demanding situation!)
post #14 of 29
Quote:
Originally Posted by drbaltazar View Post

bandwith is 384 so if you stick it close to that multiple you ll see those number are the uber setting i bet(768 instead of 850 ,1152 instead of 1250 for exemple!(but only in very demanding situation!)

Bus width is 256, first of all. Bus width has absolutely nothing to do with memory clocks. It's literally the number of memory chips on the PCB times the width of the bus that connects each chip to the GPU (32, I believe). So 8 memory chips * 32-bit = 256-bit.
Kalki
(25 items)
 
Alienware
(18 items)
 
 
CPUMotherboardGraphicsRAM
AMD FX-8320 @ 4.73GHz Gigabyte 990FXA-UD3 Radeon HD 7950 @ 1200/1800 8GB Samsung 30nm DDR3 @ 2000MHz 11-11-11-28-1T 
Hard DriveHard DriveHard DriveOptical Drive
128GB Crucial M4 1TB Seagate Barracuda 7200.12 2TB Seagate Barracuda ST 7200 RPM who cares 
CoolingCoolingCoolingCooling
XSPC Raystorm XSPC Razor HD 7970 XSPC EX240 Swiftech MCP50X 
CoolingCoolingCoolingCooling
Black Ice GT Stealth 240 2x XSPC Xinruilian 1650rpm 2x Yate Loon Slim 1800rpm Alphacool Light Tower 
OSOSMonitorKeyboard
Windows 7 Gentoo GNU/Linux Dell UltraSharp U2412M CM Storm Trigger MX Brown 
PowerCaseMouse
Corsair AX750 Corsair Carbide 300R Logitech G400 
CPUMotherboardGraphicsRAM
AMD OPTERON BULLDOZER 16-CORE 2GHZ (32GHZ TOTAL) ALIENWARE 3+1 PHASE ITX GAMING BOARD 4GB NVIDIA GEFORCE GT 430 32GB GAMING DDR3 800MHZ CL13 
Hard DriveOptical DriveCoolingOS
2TB 5400RPM GAMING HDD GAMING BLU RAY BURNER ONE GAMING CASE FAN UBUNTU W/ UNITY (I AM 1337 H4X0R) 
MonitorKeyboardPowerCase
HD-READY 24" 1366X768 PENTILE TN PANEL GAMING M... ALIENWARE TACTX UBER 1337 BACKLIT RUBBER MEMBRA... OFF-BRAND 200W GAMING PSU; 65% EFFICIENCY  ALIENWARE GAMING CASE WITH THE COOL GLOWING ALIEN 
MouseMouse PadAudioAudio
ALIENWARE TACTX GAMING MOUSE ALIENWARE MOUSEPAD IT'S DESIGNED FOR GAMING AND... BEATS AUDIO 1337 ALIENWARE TACTX 8-CHANNEL GAMING HEADSET/M... 
OtherOther
16 CORES!!!! 4GB VRAM!!!! FASTER THAN 3960X + 7... ALIENWARE GAMING CARPET 
  hide details  
Reply
Kalki
(25 items)
 
Alienware
(18 items)
 
 
CPUMotherboardGraphicsRAM
AMD FX-8320 @ 4.73GHz Gigabyte 990FXA-UD3 Radeon HD 7950 @ 1200/1800 8GB Samsung 30nm DDR3 @ 2000MHz 11-11-11-28-1T 
Hard DriveHard DriveHard DriveOptical Drive
128GB Crucial M4 1TB Seagate Barracuda 7200.12 2TB Seagate Barracuda ST 7200 RPM who cares 
CoolingCoolingCoolingCooling
XSPC Raystorm XSPC Razor HD 7970 XSPC EX240 Swiftech MCP50X 
CoolingCoolingCoolingCooling
Black Ice GT Stealth 240 2x XSPC Xinruilian 1650rpm 2x Yate Loon Slim 1800rpm Alphacool Light Tower 
OSOSMonitorKeyboard
Windows 7 Gentoo GNU/Linux Dell UltraSharp U2412M CM Storm Trigger MX Brown 
PowerCaseMouse
Corsair AX750 Corsair Carbide 300R Logitech G400 
CPUMotherboardGraphicsRAM
AMD OPTERON BULLDOZER 16-CORE 2GHZ (32GHZ TOTAL) ALIENWARE 3+1 PHASE ITX GAMING BOARD 4GB NVIDIA GEFORCE GT 430 32GB GAMING DDR3 800MHZ CL13 
Hard DriveOptical DriveCoolingOS
2TB 5400RPM GAMING HDD GAMING BLU RAY BURNER ONE GAMING CASE FAN UBUNTU W/ UNITY (I AM 1337 H4X0R) 
MonitorKeyboardPowerCase
HD-READY 24" 1366X768 PENTILE TN PANEL GAMING M... ALIENWARE TACTX UBER 1337 BACKLIT RUBBER MEMBRA... OFF-BRAND 200W GAMING PSU; 65% EFFICIENCY  ALIENWARE GAMING CASE WITH THE COOL GLOWING ALIEN 
MouseMouse PadAudioAudio
ALIENWARE TACTX GAMING MOUSE ALIENWARE MOUSEPAD IT'S DESIGNED FOR GAMING AND... BEATS AUDIO 1337 ALIENWARE TACTX 8-CHANNEL GAMING HEADSET/M... 
OtherOther
16 CORES!!!! 4GB VRAM!!!! FASTER THAN 3960X + 7... ALIENWARE GAMING CARPET 
  hide details  
Reply
post #15 of 29
Thread Starter 
Quote:
Sorry my bad, I think its your drivers then. Which driver version are on?

It's the latest CCC, not the beta one.. So it's 12.8. But the driver version is 8.892.0.0 as seen in device manager.

Note: When testing FurMark in 2500*1600 resolution with 4x AA on the situation is relatively normal. Yes, there is the sudden drop of around 30 point when I go from 1250 to 1251 but after a certain range, the memory clock starts to behave in a normal way. The more I increase it gradually, the more performance I get. The score I get with memory clock 1350 is higher than what I get at 1250 and am sure about it... tested repeatedly.. And around 1400 memory clock the score is noticeably higher than that of 1250. So that's a good thing.

Though the performance increase is slow. but it's not my concern. it's supposed to be slower while playing with memory clock than doing it with core clock.

But in lower resolution like 1366*768(default resolution of my monitor), there is no certain relation between the performance and the memory clock. Sometimes the score is slightly higher at 1250 memory clock than it is at 1450!

One explanation might be, The total bandwidth increases with the increase of memory clock. And the effect of total bandwidth is more conspicuous in more demanding resolutions and/or AA turned on..(Am I right with this? Someone correct me if I'm not.)

That might be one reason I am getting relatively expected result at higher resolution and AA turned on. But still that doesn't explain why the performance would drop just by increasing the mem clock by 1 from the stock clock, it would at least remain same, not deteriorate.
PC
(16 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570k ASRock Z77 Extreme4 Sapphire HD 7970 OC with boost G.SKILL TridentX 2400 Mhz - CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 pro Western Digital Cavier Blue ASUS DVD-R/DVD-RW drive Cooler Master Hyper 212X 
OSMonitorKeyboardPower
Windows 7 Ultimate Edition 64-bit  Samsung S24F350FHW G.Skill RIPJAWS KM570 MX Cooler Master V550 – semi-modular 
CaseMouseAudioAudio
CM 690 III Logitech G102 Prodigy Realtek ALC 898 Sennheiser HD 558 
  hide details  
Reply
PC
(16 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570k ASRock Z77 Extreme4 Sapphire HD 7970 OC with boost G.SKILL TridentX 2400 Mhz - CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 pro Western Digital Cavier Blue ASUS DVD-R/DVD-RW drive Cooler Master Hyper 212X 
OSMonitorKeyboardPower
Windows 7 Ultimate Edition 64-bit  Samsung S24F350FHW G.Skill RIPJAWS KM570 MX Cooler Master V550 – semi-modular 
CaseMouseAudioAudio
CM 690 III Logitech G102 Prodigy Realtek ALC 898 Sennheiser HD 558 
  hide details  
Reply
post #16 of 29
if you are using the screeen to generate color ,then you are probably hitting the 160 or 170 limit!of the screen.try this this let color be generated by your gpu for fun!
post #17 of 29
Yes, your correct. Running at resolutions as high as 2560x1600 would make your card more memory constricted. That's why you were able to notice the increase in FPS when benching at that resolution. Turning your resolution down would mean the card is more core constricted. Just don't worry if the card would drop in FPS if you overclock your memory by 1. I wouldn't use furmark, rather use Heaven.
post #18 of 29
Try overclocking your card by increasing the clocks by 25mhz and test. If any artifacts/grey lines/system lockup pops up, try backing down by 10mhz.
post #19 of 29
Thread Starter 
billgates8889 wrote,
Quote:
Yes, your correct. Running at resolutions as high as 2560x1600 would make your card more memory constricted. That's why you were able to notice the increase in FPS when benching at that resolution. Turning your resolution down would mean the card is more core constricted. Just don't worry if the card would drop in FPS if you overclock your memory by 1. I wouldn't use furmark, rather use Heaven.

Ya got it, billgates8889. But as I said my explanation doesn't make complete sense either.
PC
(16 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570k ASRock Z77 Extreme4 Sapphire HD 7970 OC with boost G.SKILL TridentX 2400 Mhz - CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 pro Western Digital Cavier Blue ASUS DVD-R/DVD-RW drive Cooler Master Hyper 212X 
OSMonitorKeyboardPower
Windows 7 Ultimate Edition 64-bit  Samsung S24F350FHW G.Skill RIPJAWS KM570 MX Cooler Master V550 – semi-modular 
CaseMouseAudioAudio
CM 690 III Logitech G102 Prodigy Realtek ALC 898 Sennheiser HD 558 
  hide details  
Reply
PC
(16 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570k ASRock Z77 Extreme4 Sapphire HD 7970 OC with boost G.SKILL TridentX 2400 Mhz - CL10 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 pro Western Digital Cavier Blue ASUS DVD-R/DVD-RW drive Cooler Master Hyper 212X 
OSMonitorKeyboardPower
Windows 7 Ultimate Edition 64-bit  Samsung S24F350FHW G.Skill RIPJAWS KM570 MX Cooler Master V550 – semi-modular 
CaseMouseAudioAudio
CM 690 III Logitech G102 Prodigy Realtek ALC 898 Sennheiser HD 558 
  hide details  
Reply
post #20 of 29
Just a heads up, after passing a certain point on the memory, you'll start getting decreased performance as you go higher on the mem clocks.

Why? You're hitting the ECC (error correction code) wall, where increased clocks after a certain point gives you lower performance. The wall depends on the card.
Kukumonster
(13 items)
 
A pleasant surprise :)
Cooler Master USP 100 Black Edition
Value redefined.
Amd Athlon II X3 435
CPUMotherboardGraphicsRAM
Core i5 2320 Intel DH67BL Sapphire R9 285 Corsair 8GB (4x2)  
Hard DriveHard DriveHard DriveCooling
Kingston HyperX Fury 240GB  WD Blue 1TB Seagate Barracuda 500GB Noctua NH-C14S 
CoolingOSMonitorPower
Noctua NF-A140*2 Windows 10 Pro (TP) LG 22" 1080p  Seasonic G-550 F3 550W 
Case
Cooler Master USP100 Black Edition 
  hide details  
Reply
Kukumonster
(13 items)
 
A pleasant surprise :)
Cooler Master USP 100 Black Edition
Value redefined.
Amd Athlon II X3 435
CPUMotherboardGraphicsRAM
Core i5 2320 Intel DH67BL Sapphire R9 285 Corsair 8GB (4x2)  
Hard DriveHard DriveHard DriveCooling
Kingston HyperX Fury 240GB  WD Blue 1TB Seagate Barracuda 500GB Noctua NH-C14S 
CoolingOSMonitorPower
Noctua NF-A140*2 Windows 10 Pro (TP) LG 22" 1080p  Seasonic G-550 F3 550W 
Case
Cooler Master USP100 Black Edition 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD/ATI
Overclock.net › Forums › Graphics Cards › AMD/ATI › HD 7850 performance decrease while increasing memory clock..