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Overclocking a 6970 queries

post #1 of 3
Thread Starter 
I just wanted to know what people were able to get stable overclocking with stock voltages.

I cant get past 915 core and memory doesnt wanna go further than 1500.

What do you guys think?
post #2 of 3
Quote:
Originally Posted by stomii View Post
I just wanted to know what people were able to get stable overclocking with stock voltages.

I cant get past 915 core and memory doesnt wanna go further than 1500.

What do you guys think?
You have to increase volatge along with the OC. with the combination of Power Setting +20& in CC Overdrive. Find the highest OC with the benefit of performance gains with losest possible voltage. There is no point to raise the memory clock beyond 1500 for daily gaming. You will normally get diminishing return after 1450-1475. But it depends on how you combine the core/memory clocks and voltage to achieve maximum performance.

There is no fix rules. Everything is trial and error. Also watch out for the fullload temperature. If you are on air, 75°C is considered safe for 24/7.

Edit:

On stock voltage 1.17v + Power settings +20% ? 940/1475 MHz.
Edited by Ken1649 - 10/15/11 at 1:04am
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post #3 of 3
It is true that the 6950/6970 ram yields diminishing returns between certain speeds. It's because GDDR throws a LOT of errors which have to be corrected, and at faster speeds, more errors havge to be corrected faster.

After a certain point, though (usually about 1500) the sheer bandwidth of the ram makes up for the ECC and you start seeing performance gains.

But yes, you can increase voltage using programs such as afterburner so you can get high clocks.
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CPUMotherboardGraphicsRAM
Intel 2500k 4.7GHz  Asus P8P67 Pro(B3) 2 x Club3D 280X 3GB 16GB g.skill 1600MHz C9 
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Samsung 840 Pro 256GB 4 x 2TB Barracudas in RAID10 2 x WD Blue 1TB RAID0 2 x 3TB Seagate Barracuda 
Hard DriveHard DriveOptical DriveCooling
8 x 146GB HP 10k SAS - various RAID levels RAID Controller LSI 9260-8i 512MB LiteOn IHAS124 Noctua NH-D15 
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8.1 Enterprise Acer GD245HQ (120hz) LG W2420P LG IPS231P 
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