GPU options: single 7950 or 2x7850

[wijawara]

Have anyone measured the power consumption for both GPU? Is single 7950 better than 2x7850 in terms of efficiency (MHS/watt)?

Edit: Two 7850s would have much higher number of processing core than a 7950.

[litecoin_messiah]

i got gigabyte 7950 flashed with f43 firmware and im sure nothing else can beat it by power to khash ratio.

[tigusoft]

I would take 1x7950. Hashrate lower than 2x7850 but less power needed. One card is easy to configure for mining,  lower temperatures are simpler to maintain (especially in closed case).

[Moogle]

i have a 9750 and am pretty chuffed with it.
haven't flashed it like. might have to be something i look into

[tonyk2005]

You've also gotta think ahead, if you decide in the future to expand your mining operation then having one slot already taken up instead of two will be a big bonus.  I personally found my 7950 (MSI Twin Frozr iii) easier to undervolt than my 7850 (Radeon) so I can drop the power consumption of that card even more.

[wijawara]

Checked with friend's rigs. It looked like heat output is greater in 2x7850 than a single 7950. But a single 7950 has slightly lower hrate.

~660MHS vs ~580MHS