Overclock.net › Forums › Graphics Cards › AMD/ATI › Is my PSU limiting my overclock potential?
New Posts  All Forums:Forum Nav:

Is my PSU limiting my overclock potential?

post #1 of 5
Thread Starter 
Is it possible that my PSU is limiting my ability to overclock my 7990? I've had terrible luck overclocking crossfire 7970s and now am having pretty much the same experience with this single PCB 7990.

Trying to do the usual incremental overclocking with applicable voltage bumps but I wonder if the overclock is taxing my PSU to its limits and causing the instability. My card is voltage unlocked as you can see in the picture. I can't get above 1050 and no matter what I put the voltage to pumping more juice doesn't increase stability. I either get the DXGUI_DEVICE_REMOVED or display driver crashes instantly at anything over 1050. I've tried un-syncing settings for similar graphics processors in apps like Afterburner and Trixx but since it is a single board I don't get a voltage option on the second GPU.



I have the XFX 850W black edition from a while back that was 80 Plus Silver certified. But I am also running a 2500k OC'd to 4.6 ghz, 2 mechanical drives(Samsung F3s), 1 SSD, 3 Aerocool Shark case fans, 1 200m top fan, and the 2 fans on my NH-D14 all hooked up to my fan my controller.


Any ideas?
post #2 of 5
Not According to this review

http://www.techspot.com/review/663-amd-radeon-hd-7990/page8.html

http://www.guru3d.com/articles_pages/radeon_hd_7990_review,8.html

crossfire 7970 and 7990 should have almost same power consumption

But could be as PSU's over time reduce their efficiency
my budget gaming
(10 items)
 
   
CPUMotherboardGraphicsRAM
i5 4570 Asus Z87-m Plus Zotac GTX 750 ti OC 8gb (4gb x 2) Samsung DDR3 1333 LV 
Hard DriveHard DriveCoolingOS
Western Digital 1tb Seagate 2tb stock Windows 8.1 Pro 
MonitorCase
HP Elitedisplay E231 abko ncore s2 mini tower 
CPUMotherboardGraphicsGraphics
i7 4770k Gigabyte G1 Sniper 5 XFX r9 290 XFX R9 290X BF4 Edition 
GraphicsGraphicsRAMHard Drive
Power color R9 290 Sapphire R9 290X BF4 Edition G.Skill Trident X 2666 mhz CL12 Samsung 840 EVO 250gb 
Optical DriveCoolingOSMonitor
Samsung DVD writer Custom Water cooling WIndows 8.1 Professional Crossover 3020MDP 
MonitorMonitorKeyboardPower
Crossover 30X-P  Crossover 30X-p Steel Series 6Gv2 Mechanical Keyboard with Cher... Corsair ax1500i 
CaseMouseAudioOther
Corsair 900D Logitech G100 Creative 3d Core (stock G1 Sniper 5) Corsair Vengeance 1400 Analog Gaming Headset 
  hide details  
Reply
my budget gaming
(10 items)
 
   
CPUMotherboardGraphicsRAM
i5 4570 Asus Z87-m Plus Zotac GTX 750 ti OC 8gb (4gb x 2) Samsung DDR3 1333 LV 
Hard DriveHard DriveCoolingOS
Western Digital 1tb Seagate 2tb stock Windows 8.1 Pro 
MonitorCase
HP Elitedisplay E231 abko ncore s2 mini tower 
CPUMotherboardGraphicsGraphics
i7 4770k Gigabyte G1 Sniper 5 XFX r9 290 XFX R9 290X BF4 Edition 
GraphicsGraphicsRAMHard Drive
Power color R9 290 Sapphire R9 290X BF4 Edition G.Skill Trident X 2666 mhz CL12 Samsung 840 EVO 250gb 
Optical DriveCoolingOSMonitor
Samsung DVD writer Custom Water cooling WIndows 8.1 Professional Crossover 3020MDP 
MonitorMonitorKeyboardPower
Crossover 30X-P  Crossover 30X-p Steel Series 6Gv2 Mechanical Keyboard with Cher... Corsair ax1500i 
CaseMouseAudioOther
Corsair 900D Logitech G100 Creative 3d Core (stock G1 Sniper 5) Corsair Vengeance 1400 Analog Gaming Headset 
  hide details  
Reply
post #3 of 5
Thread Starter 
I find that if I'm testing for my overclocks and stability that if I crash once that my screen will start displaying weird groups of horizontal artifacting white lines unless I click reset in afterburner. If I do ANYTHING like even strangely lower my voltage they reappear, if i increase it, they reappear. Same with core clock. If its less than stock they appear and if its higher they reappear. Everytime I crash I basically have to reboot for my card to begin functioning correctly again...

I can't even overclock to the max CCC overdrive limits of 1125/1575 without an instant crash. Sucks!
post #4 of 5
Since you have concern that the psu is the limiting factor have you tried using a different psu, or just putting in a single gpu? For example disable crossfire and try to oc the single core.

Next, since you think it is a power problem you can try to return the 2500k to the original stock settings so that the psu is freed from that burden. Then try to OC again.

Also, use a program like HWinfo to monitor the power draw when overclocking and stress testing so that you can nail down the exact power consumption.

Then you can attempt to go back and use older CCC drivers to see if maybe that it is coming from some type of software problem (which I doubt.)

And finally, with 70 amps on your 12v I would assume that you would have more than enough power for that system. So if you have a voltage throughput tester like the kill-o-watt reader try that while running furmark, prime 95, and some memtest to see what the systems overall consumption is.
Blue
(19 items)
 
Dirty 6
(11 items)
 
 
CPUMotherboardGraphicsRAM
4930k @ 4.5ghz HT  Sabertooth X79 2x Asus DirectCU 7970 @ 1200/1600 16gb Gskill 2400 @ 10-12-11-30  
Hard DriveOptical DriveOptical DriveCooling
2xCorsair Gt 120gb Raid 0 2tb HDD (2x1tb [ Raid 0 ]64mb cache) 500gb HDD Custom Watercooling Loop 
CoolingCoolingCoolingCooling
XSPC 750 XSPC Raystorm Alphacool WHITE 360mm Monsta 7 x Artic F12 Case Fans Custom Sleeved in White... 
OSMonitorKeyboardPower
Win10 64bit 3 x 21.5in Led 1080p Eyefinity Corsair K90  750 Evo Blue 
CaseMouseMouse Pad
Haf 932 Func MS3^2 Ikari Laser & Rat 7 & Deathadder & L... Func XL 
CPUMotherboardGraphicsRAM
Amd 8350 @ 4.5 stock voltage MSI 890GXM-gd65 Asus DCII GTX 660 16gb Gskill DDR3 1600@ 8-8-8-24 
Hard DriveOptical DriveCoolingCooling
120GB revo drive None Sycthe Big Shuriken 2 Modded Titan TTC-HDC4 HDD 
OSPowerCase
Window 7 64bit  750w Evo Blue Modular PSU White Silverstone Sugo sg02 
  hide details  
Reply
Blue
(19 items)
 
Dirty 6
(11 items)
 
 
CPUMotherboardGraphicsRAM
4930k @ 4.5ghz HT  Sabertooth X79 2x Asus DirectCU 7970 @ 1200/1600 16gb Gskill 2400 @ 10-12-11-30  
Hard DriveOptical DriveOptical DriveCooling
2xCorsair Gt 120gb Raid 0 2tb HDD (2x1tb [ Raid 0 ]64mb cache) 500gb HDD Custom Watercooling Loop 
CoolingCoolingCoolingCooling
XSPC 750 XSPC Raystorm Alphacool WHITE 360mm Monsta 7 x Artic F12 Case Fans Custom Sleeved in White... 
OSMonitorKeyboardPower
Win10 64bit 3 x 21.5in Led 1080p Eyefinity Corsair K90  750 Evo Blue 
CaseMouseMouse Pad
Haf 932 Func MS3^2 Ikari Laser & Rat 7 & Deathadder & L... Func XL 
CPUMotherboardGraphicsRAM
Amd 8350 @ 4.5 stock voltage MSI 890GXM-gd65 Asus DCII GTX 660 16gb Gskill DDR3 1600@ 8-8-8-24 
Hard DriveOptical DriveCoolingCooling
120GB revo drive None Sycthe Big Shuriken 2 Modded Titan TTC-HDC4 HDD 
OSPowerCase
Window 7 64bit  750w Evo Blue Modular PSU White Silverstone Sugo sg02 
  hide details  
Reply
post #5 of 5
I don't think it's a PSU problem. 850 watts from a quality unit like that XFX will be plenty. Most likely it's the card. It might just be topping out.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD/ATI
Overclock.net › Forums › Graphics Cards › AMD/ATI › Is my PSU limiting my overclock potential?