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To overclock today we are using Catalyst Control Center. Overclocking initially was problematic.
On the I/O plate of the VTX3D HD7990 is a red button. This is a dual button BIOS switch, with both core speeds configured to a turbo of 925mhz. You can however only overclock this card with the button pressed inwards.
Another obstacle had to be removed. AMD's ULPS needs disabled – this is the way that AMD reduce power demand from the second card in Crossfire, although it causes issues for overclocking, causing a BSOD with the VTX3D HD7990. Open REGEDIT, search for ‘enableULPS' and change the registry value from 1 to 0.
To confirm ULPS is off you can check the second card readings in GPUz. If GPUz shows ULPS is still active then it hasn't worked.
It is important to note that you need to overclock both HD7970 GPU's in Catalyst Control Center to the same speeds and apply the changes.
We managed to push both GPU cores to 1,050mhz, from 925mhz which translates to a 13.5% increase. The GDDR5 memory could be overclocked from 1,375mhz to 1,500mhz, translating to a 9% increase. Every sample will be slightly different although this takes each of the GPU cores to the latest HD7970 ‘GHZ' AMD Edition standard.
The high overclock helps generate another 1,100 points, from 15,113 to 16,244. A healthy increase.
dear lord, my epenis is so small right now 🙁
Seems like a great price point, even though it costs as much as my system im working on right now!
Bit of a bargain for the high end gamers with loads of disposable budget.
both this and the GTX690 are quite power efficient, considering!
Would have been nice to see two HD7870 Tahiti LE’s in CF, just to give a viewpoint of what could be achieved with around £400.
Good review otherwise, dream system material
Seems I got one of the five left 🙂 just in time ! thanks for review ! awesom!
what power supply will you be using Tom?
just ordered a 1000W Seasonic, as I needed to move up from my older 750W corsair.
Costly day, I hate this site sometimes 🙁
Sadly the framerates DON’T tell the whole story as Hardocp and Tech report have shown, crossfire might show higher framerates but real world game play is not as smooth as SLI.
Real world gameplay was perfectly smooth on the HD7990 with the latest AMD beta drivers – unless there is a Crossfire glitch with a specific game I didn’t test (which is possible as that can happen). I was playing games on it for a few days.
Wow, this thing is ridiculous, I need a new card lol
AweSoMe!!!