Can anyone using a 6870 x2 (dual core) give me some mining specs

[Zedster]

Hey folks,

Looking at a 6870 x2 instead of a 7970. Getting a good price on the dual GPU.  The specs for the dual core 6870 aren't really on the comparison page.  Does anyone have experience with them?  Hashing rates, temperatures and fan noise if ya can.

TIA

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[Protagonus]

For LTC or BTC?  I can only pass on info, not used those cards yet.

I assume LTC but there are quite a few for single core on the;
BTC comparison and settings; https://en.bitcoin.it/wiki/Mining_hardware_comparison

There are 2 at least on the LTC comparison; https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison
it would appear from the setting notes on those 6870's, that they are tuned in; so consider that a maximum.

BTC 280-320 Mh/s
LTC 280 -350 Kh/s

Suppose also the 6870 should be appx. 26% higher than the 6850 to help draw more numbers from comparisons

the AMD hardware list doesn't show a dual core 6870 to get stats from; but presumably about double a single core I would assume.  So 560-700 Kh/s LTC.  The max wattage would be a tad higher than the 7970.

[Zedster]

Wow thanks for the reply but you sadly posted nothing relevant to my question.

It makes no difference to me if we talk LTC or BTC as BTC is generally 10x that of LTC.

I am not interested in single core 6870 stats as those are easily found.

I do not want to make assumptions that a dual a core is double a single.  That is why I made the post.

I guess a screwed up by making the assumption that I had checked the comparison pages and found nothing that people would know I had already checked the pages you linked.

See what assuming does.

[Moshi]

Wow thanks for the reply but you sadly posted nothing relevant to my question.

It makes no difference to me if we talk LTC or BTC as BTC is generally 10x that of LTC.

I am not interested in single core 6870 stats as those are easily found.

I do not want to make assumptions that a dual a core is double a single.  That is why I made the post.

I guess a screwed up by making the assumption that I had checked the comparison pages and found nothing that people would know I had already checked the pages you linked.

See what assuming does.

It's actually a pretty fair assumption that two 6870 GPUs would be about twice the hashrate of one, given they're clocked identically. That may not be the case (although I don't think I've ever seen a dual-GPU 6870 board), and they may be clocked slightly lower.

Since they're the same cores as the single-GPU 6870, I would say divide the hashrate in the hardware comparison list by the given clock, multiply that number by the GPU clock on the card you're getting, and double it. So long as it doesn't implode or something, that's you're best guess as to the hashrate.

[Zedster]

Wow thanks for the reply but you sadly posted nothing relevant to my question.

It makes no difference to me if we talk LTC or BTC as BTC is generally 10x that of LTC.

I am not interested in single core 6870 stats as those are easily found.

I do not want to make assumptions that a dual a core is double a single.  That is why I made the post.

I guess a screwed up by making the assumption that I had checked the comparison pages and found nothing that people would know I had already checked the pages you linked.

See what assuming does.

It's actually a pretty fair assumption that two 6870 GPUs would be about twice the hashrate of one, given they're clocked identically. That may not be the case (although I don't think I've ever seen a dual-GPU 6870 board), and they may be clocked slightly lower.

Since they're the same cores as the single-GPU 6870, I would say divide the hashrate in the hardware comparison list by the given clock, multiply that number by the GPU clock on the card you're getting, and double it. So long as it doesn't implode or something, that's you're best guess as to the hashrate.

This is the card in question: VTX3D Radeon HD 6870X2, 2GB GDDR5, PCIe  It's basically a Powercolor card. 

Imploding sounds no fun.

[Protagonus]

In all actuality; as long as you have a few GPU Hash rates for reference.  You CAN assume many cards final hash by various things.  Bit width, gflops/s etc.   EG- 7790 isn't a very commonly rated as well but will net the relative advantage it has, in gflops/s, over the 7750.

Not sure why you would want a card with a lower efficiency either (Mh/J or Kh/J) as compared to the more modern 7970.  Any initial saving would be quickly lost even assuming (yes) same Kh/s on both cards.