The HD6970 is one of AMD’s Cayman chips, cast in a slightly larger die size than the previous Barts and Cypress chips
2GB of GDDR5 1375MHZ memory (5500MHz effective)
System requirements state a 600 Watt or greater power supply with two 150W 8-pin PCI Express power connectors
Asus have applied their own Direct CUII cooler to this card which has turned it into a three bay monster
On the Marshall motherboard this consumes the first three PCI-E slots
The cooler is huge, but nowhere near as noisy as I thought it would be
Even overclocking the beast didn’t raise the noise level to excess in auto fan mode
Saying that, I only had to bump the voltage up one notch for the overclocks on air
Put the fans on manual control and ramp them up to 100% and they’re loud
With overclocks varying for each benchmark from 980 to 1015 with this cooler I’m feeling so-so about its capabilities
Time to move on to the watercooling
When overclocking this card I had to use a combination of the Cataylst centre and Asus Smart doctor
Catalyst only allows me to add voltage in a percentage mode, maxing out at 20%
Smart doctor on the other hand lets me take the voltage much higher, but it’s a pita to use
For some reason smart doctor doesn’t recognise keyboard movements and using the mouse to move that slider is absolutely useless when using a screen res of 1920x1200, it just won’t settle on the right point
Smart doctor increases the GPU speed in steps of 6 and 7 and increases the memory in steps of 8 and 9
Catalyst increases both of these in steps of 5
Afterburner and Tryxx allows you to use the arrow keys on the keyboard for this and it’s so much easier to use them, unfortunately they don’t seem to recognise the voltage controller that’s on this card
With Win 7 I used Catalyst for the GPU and Memory control and Smart doctor for the voltage control
In Win XP I disabled overclocking in Catalyst and concentrated on Smart doctor only
Comparing Win XP to Win 7 in the GPU benchmarks
3DMark01
Win XP and Smart doctor managed to reach GPU 1087 x Mem 1472
This setting scored 96320 points and took me to 25th out of 50. Still not worth a point though
Running the tests in a specific order definitely increases the score here
Win 7 and Catalyst hit 1070x1470 and only managed to score 76807
That’s a deficit of 19513
The tests I ran at stock speeds had a similar result
Win 7 scored 74393 while XP scored 95256
3DMark03
I was getting increasingly fed up with the twitchy interface in Smart doctor and kept reverting to setting the clocks in catalyst at times
Again XP scored higher on this bench overclocking to 1080x1468
108417 points puts me 24th out of 58 and picks up 1 HW point
Win 7 overclocked to 1080 x 1470 and managed 107905 points
This wasn’t the way of it at stock speeds though
XP scored 96756 at stock while Win 7 managed 97246, I was almost believing that win 7 was finally catching XP until I overclocked
3DMark05
Win 7 came out on top in this test, overclocking to 1090x1470
39979 points is only marginally better than the overclock on air
No movement in the rankings and no points
Xp only managed 39670 points, overclocking to 1087x1468
3DMark06
XP leads again in this bench, overclocking to 1080x1468
The score of 31060 points isn’t much of an improvement on the air overclock
Moving up 1 to 45th out of 74 still doesn’t get any points
Win 7 overclocked to 1085x1460 and scored 30496
This isn’t too far behind XP but it’s still behind
I can’t keep hold of this card any longer, I’ve had it long enough
If I don’t give him it back soon, he’ll get too attached to my 580
Time for a summary soon