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Is GPU-Z right?

Joined
Oct 27, 2007
Messages
1,132 (0.18/day)
System Name Grandpa
Processor i5 4690K
Motherboard Gigabyte Z97X-UD5H-BK
Cooling water
Memory 8GB Corsair Vengence 2400MHz
Video Card(s) Gigabyte 5850 x2
Storage Samsung SM951
Display(s) Catleap 27"
Case coolermaster stacker
Power Supply corsair AX860i
Mouse logitech g5 original
Keyboard Ducky
Software Windows 8.1
I have an XFX 8800 Ultra XXX. It's specified speeds are GPU 675, Shaders 1675, Mem 1150. GPU-Z says it is 685/1692/1150, RivaTuner says its 684/1674/1152. Which one is right?

I've never edited the bios and the card is currently at stock (xxx though). I bought the card second hand over a year ago, is it possible the bios was edited? GPU-Z States the bios version is 60.80.18.00.1E and this "seems" to be official.

The card is running too hot at the moment because it's summer here. What would be the eaiest way to try downclocking the card? I've ordered a HR-03 that should help a lot but was wondering if I can temprarily slow it down a little. BTW, I'm using using Vista 64.
 
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