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HD 7950 Crossfire Overclocking issues.

post #1 of 8
Thread Starter 
I built a new, almost identical build ( See Sig Rig, newer Coolermaster 1000w PSU, i5 3570k ) for a lanbox with the Coolermaster XB. I ordered two XFX DD 7950's because they came with a lifetime warranty. Well.

*Card One* has an ASIC quality of 63%, requiring 1069 mV, 800 MHZ stock. I let the card stay in the tower by itself for a day, played with the overclocking a little, nothing crazy, and found a comfy 1100 / 1575 OC on card 1.

*Card Two*, when I plopped it in the next day, surprised me. It came in a stock of 900 MHZ, STOCK. At 978 mV, with an asic of 96%. Figuring I got an awesome card, I played with the overclocking, and found it was capable of 1350 / 1800 at mV 1185. Awesome, cool. I let that card stay in the tower by itself for one day, where I experienced an annoying fan sound coming from it, but it stopped making it overnight when I left my computer on. New Day, Crossfire.

Problem after problem popped up the moment my computer came on. Blue Screens, Red Screens with Gray lines, terrible screen flickering. This was solved by disabling the zero point power via the registry, but the small amount of monitor flicker remains, something I never saw with my 680's.

FINALLY getting it stable, without overclocking, I dink around a little with it for Crysis 3. The voltage of Card One will not raise above 1150 in crossfire, even with Card Sync off. Manually overclock it by itself, it jumps back down. Even something like 1180, it won't do it. The other card can go up, but when I get into games, the Core Clock of *Card Two* makes the other jump with it, and since *Card One* can't raise it's voltage, drivers crash.

I can't get these things to go above 1100 in Crossfire. Is it the luck of the draw, or is their anything else I can try?
post #2 of 8
Thread Starter 
Nobody? All this noise about how awesome 7950's are, I listen to you guys and give them a try, and no one is being helpful? Ok.
post #3 of 8
Are you stable at stock settings? As in, uninstall AB/ATI Drivers. Re-install ATI drivers, and make sure you are 100% stable. If you can get that working how it should, then you can install AB start OC'ing if you want. Or (and this is what I would suggest), screw AB and just OC within CCC. No you won't be able to get as high of an overclock, but unless you are gaming at 1440p (and even then), you don't need a extreme OC.
post #4 of 8
Thread Starter 
Alright, I'll give it a try. Any ideas on why two of the same cards have different stock clocks? One is 800 and the other is 900.
post #5 of 8
Try to see if they are on the same bios version. If not, flash them both to the newest version and try oc'ing again.
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Hard DriveHard DriveHard DriveOptical Drive
Samsung 830 128GB SSD (System) Seagate Barracuda 2TB (Data) Samsung 840 250GB SSD (Software) Lite-On iHBS112 Blu-Ray Burner 
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Corsair H100i + 2x Noctua NF-F12 Windows 10 Pro ASUS VG248QE 120Hz + LightBoost Ducky DK2108 
PowerCaseMouse
Cooler Master Silent Pro M2 1000W Corsair Carbide 500R Razer Deathadder 3.5G 
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post #6 of 8
Inrease the power limit on Afterburner to +20%

Also you need to read this before you try to oc

http://www.overclock.net/t/1265543/the-amd-how-to-thread
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post #7 of 8
Thread Starter 
Won't flashing their bios void the warranty? Also, XFX has said they have no newer bios for the 7950, which means I'm thinking I accidently got a Black Edition bios or something? I'm not entirely sure. I did, however, do I fresh reinstall of the drivers taking all those steps, and performance did go up pretty well, Crysis 3 ran well, and BF3 stays at a solid 120 fps.

Something else I wanted to ask, when displaying vram used, I see over 3000 sometimes. Do AMD card stack memory, or am I really seeing like 1500 or something. Not sure how to phrase the question.
post #8 of 8
If your talking about the used memory log in afterburner, then it shows up like that for some reason. You are really not using more vram than you have.
   
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I7-3770K Gigabyte GA-Z77X-UP7 Saphire R9 290 Saphire R9 290 
RAMHard DriveHard DriveHard Drive
Corsair Dominator Platinum OCZ Vertex 4  OCZ Vertex 4 Seagate  
CoolingOSMonitorKeyboard
Custom Loop Windows 8.1 QNIX QX2710LED Logitech G710 
PowerCaseMouseAudio
Cooler Master V1000 Zalman GS1000 Logitech G502 Sound Blaster Z 
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