Best 7970 for mining

[biganth]

I'm building a rig for LTC and I'm looking for info on which 7970 would give the best performance (not considering electricity). I found a Tom's Hardware post http://www.tomshardware.com/reviews/radeon-hd-7970-overclock-review,3186.html comparing them, but looking for some specific mining info. Thanks.

[phylogrammet]

I've been through Every Newegg and Amazon card as well as Tiger Direct, Microcenter and Fry's.

I can't find a single 7970 that has unlocked voltages.

I'm going 7950 I guess.

[PeterChang]

I'm building a rig for LTC and I'm looking for info on which 7970 would give the best performance (not considering electricity). I found a Tom's Hardware post http://www.tomshardware.com/reviews/radeon-hd-7970-overclock-review,3186.html comparing them, but looking for some specific mining info. Thanks.

I do really like the MSI 7970 Lightning, though it's gotten hard to find one lately. After reading through the review it looks like the Sapphire one might be a good 7970 to get, also overclocked 7950s are also a good option as well.

[Rogue]

Im building my rig with 6990's they are probably the best GPU i've seen. And yes i've looked up the specs on over a couple hundred GPU's

[phylogrammet]

NCIX has a R7970-2PMD3GD5/OC which seems to be a reference board.

No free games with it; however.

[biganth]

Im building my rig with 6990's they are probably the best GPU i've seen. And yes i've looked up the specs on over a couple hundred GPU's

From the looks of it here https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison#wiki-ATI_AMD_GPUs the 6990's definitely look like they way to go.

Anyone out there who has mined with both?

[biganth]

Im building my rig with 6990's they are probably the best GPU i've seen. And yes i've looked up the specs on over a couple hundred GPU's

Are you planning on going with 3 or 4 per board?

[biganth]

The 6990's seem impossible to find new...

[crazyates]

I've been through Every Newegg and Amazon card as well as Tiger Direct, Microcenter and Fry's.

I can't find a single 7970 that has unlocked voltages.

I'm going 7950 I guess.

My early model Gigabyte 7970 GHz edition lets you change the voltages. It's the one with the 1100MHz clock, not the newer one.

[ryantc]

I've been through Every Newegg and Amazon card as well as Tiger Direct, Microcenter and Fry's.

I can't find a single 7970 that has unlocked voltages.

I'm going 7950 I guess.

actually I just got two of powercolor 7970 V3, and they have unclocked voltage and with dual fan configuration it mines very quite

the only drawback is I haven't been able to mine LTC over 550Kh/s

[BlazinBeaches]

Sapphire is voltage unlocked

[systic]

cheaper to get 7950's for 100$ less per card and hash at almost the same rate

[Oreganobag]

I would go with the 7950s. I got 7970s for my first rig, and the value for 7950s is much better. Will probably hold their value just as well on the second hand market if you ever sell, too.

I use Sapphire 7970 OC Dual-Xs and those are voltage unlocked.