4850x2 smacks GTX280

I actually don't have a link, this is what I've herd informally from a couple people but I could be wrong. Where did you find information that suggested GDDR5 was lower power consumption then GDDR3?
 
it's not that the quantity of vram is lower it's that the 4850x2 uses gddr3 not gddr5, that's what ends up lowering power consumption. Well that along with the lower core clock.

Actually, when comparing 4870 X2 to 4870 Crossfire, only the quantity of vram is different. It's GDDR5 to GDDR5.
 
hmmmm well I will double check tomorrow. Maybe the GDDR5 interface on the chip side is what sucks the majority of the power?

Actually, when comparing 4870 X2 to 4870 Crossfire, only the quantity of vram is different. It's GDDR5 to GDDR5.

I read your post way too fast, for some reason I thought you were comparing 4850x2 to 4870x2 and saying that the lower amount VRam on the former (assuming here that it's 512x2) will explain the power consumption delta. Lol sorry about that, i've been studying all day and my brain feels like apple sauce :/
 
Or could it be one of the classics, "30 percent less than their GDDR3 counterparts - when running at same effective clockspeed"?
So GDDR5 running at 500MHz (2GHz effective) would consume 30% less than GDDR3 running at 1GHz (2GHz effective)?
 
Power consumption drops by 35W when lowering GDDR5 freq. from 1025MHz to 465MHz!

Because there some GPU-parts (X-bar) bounded to the GDDR5 clock.
GDDR5 chips are below 1.5V and and have 2.5W TDP @ 2.5GHz.


http://www.extremetech.com/article2/0,2845,2309887,00.asp
 
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