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Gigabyte 7950 Overclocking Assistance

post #1 of 3
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So I got my WF3 card today and I've been messing with it a bit. I started with AMD Overdrive, but it can't seem to get past 1025 mhz at 20% power boost. So I installed MSI Afterburner 2.2.4, added the .dlls and the cfg edits so I know I had full control. Starting with the F21 BIOS (out of the box) I attempted to change the voltage, but no matter what I did (turned off overdrive, stopped ccc from starting with windows, locked voltage) I couldn't get it to change the values for VDDC that GPUz was showing. Idle at 861 mV and load at 1055 mV. Then I tried flashing a 7970 BIOS, but for whatever reason I tried 2 and both times the card wasn't able to be recognized by windows/catalyst. I even did a clean install of the drivers to be sure. So I tried the F3 BIOS that just came out, and when I locked the voltage it seemed to make a difference, i set it at 1150 mV and GPUz showed VDDC at 1124 mV. So I left the memory clock alone and started at 1050 mhz on the core. I ran the Heaven benchmark, and while it was running I checked GPUz and the VDDC was at 1061 mV! I don't understand, do these cards have vdrop/vdroop or something? What am I doing wrong? I know I moved somewhat quickly with the testing, but I wasn't looking for stable (at least once I realized I couldn't make sense of how to overclock the card) I was looking for consistent voltage control. I realize that every card clocks differently in the end, but generally the process to get there is the same. How can I get my card to maintain voltage at load? Thanks for any suggestions.
post #2 of 3
Other then the software you use to control the volts, there is not much you can do but play and test your vcore and memory and see what is the highest, peek safe volt, stable speeds.

It's not like you can take a pencil to the pcb or go into bios to control the gpu vdroop like you can with a CPU overclock.
 
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BitoHeaven
(16 items)
 
Cigar ATX PC
(14 items)
 
CPUMotherboardGraphicsGraphics
Intel i7 4770k @ 4.5GHz Asus Maximus VI Gene Gigabyte R9 290 @ 1160MHz/1350MHz Gigabyte R9 290 @ 1160MHz/1350MHz 
RAMHard DriveHard DriveOptical Drive
G.Skill Trident X 2X8GB DDR3 2400MHz Samsung 840 PRO 256GB  Seagate Barracuda 7200.14 3TB SATA III 6Gb/s 64... Pioneer Blu-ray Burner 
CoolingOSMonitorKeyboard
Liquid Single Loop Triple Radiators Win 7 SP1 Professional x64bit  Samsung SynchMaster 24" Widescreen 1200p TFT-LC... Logitech G15 
PowerCaseMouseMouse Pad
EVGA SuperNOVA G2 1300w 80+ Gold Fully Modular  Fractal Design Arc Midi R2 Microsoft Sidewinder X5 Allsop Redmond Mouse Pad 
Audio
Cambridge Soundworks 5.1 
CPUMotherboardGraphicsRAM
Intel Core i5-3570K @ 4.6GHz ASRock Z77E-ITX mITX  Sapphire HD 7990 @ 1090MHz/1600MHz G.SKILL Ripjaws 2X4GB DDR3-1600 @ 1866MHz 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD 128GB mSATA SATA III 6GB  Seagate Barracuda 7200.12 1TB SATA II 32MB 7200RPM LG DVD R/W SATA with LightScribe Corsair Cooling Hydro Series H100 
OSMonitorKeyboardPower
Win 7 Professional x64bit Samsung 52" 1080p 60Hz LCD Logitech Wireless K330 Corsair AX850 Gold Fully Modular 
CaseMouseMouse PadAudio
BitFenix Prodigy Mini-ATX Black  Logitech Wireless M215 Corsair Vengeance MM200 Yamaha RX-V681 & PSB/Polk Audio 5.1 
CPUMotherboardGraphicsRAM
AMD Athlon II X4 640 ASRock N68C-GS NVIDIA 6600GT G. Skill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 500GB 16MB Cache 7200RPM LG Optical Drive Thermaltake Max Orb Windows 7 
MonitorKeyboardPowerCase
Viewsonic 19” Flatscreen CRT Gigabyte GK-K6800 103  Thermaltake TR2 600W Cigar Boxes 
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post #3 of 3
I'd used Sapphire Trixx for overvolting. Yes, depending on your ASIC, your ASIC/vdrop would be higher/lower.

When I'm overclocking/overvolting, I would usually try and hit the wall. Increase your core clocks first then your memory clocks. The way I'd do it would be, increase 50 mhz over stock clocks and test. If there's artifacting, back it down by 25. If its stable once you've backed it down, up it by 12. Continue doing this till you've found you final core clock.

For overvolting, I would increase the clocks by 50 over stock clocks, then test. Keep adding 50 till you start artifacting/locking up. Then increase your voltage by 0.025v or 25mv. Test if its stable. Increase the voltage by another 25mv until its stable. Just repeat the process till you've hit that wall, when not matter how much voltage you feed it, it would lockup or artifact. IMPORTANT: Don't walk away from your computer when your stress testing, keep an eye on the temperature. Design a fan profile that would keep the temperature under 85 in load.
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