<p>A single instance of cgminer handles multiple GPUs, so there is no need to run separate processes.  Enabling SLI(You aren't using NVIDIA cards, right...) or Crossfire will decrease mining performance, so leave it off.</p>

<p>There is no overhead associated with running multiple GPUs on a single system, unless the cards are physically spaced so close together that they overheat and throttle. 7 1.2 Mh/s cards would be expected to produce 8.4 Mh/s total.</p>

<p>At this point, investing in new GPUs for mining is questionable, and you should only consider GPU mining for scrypt-based altcoins such as Litecoin, as ASICs have made GPUs unviable for bitcoin mining.</p>

CC BY-SA 3.0
2013-11-16T08:08:07.817Z
2013-11-16T08:08:07.817Z
Dust
<p>If I were to purchase a motherboard with 7 pci-ex ports. Could I then attach 7 graphic cards and run 7 cgminer processes? One for each card?</p>

<p>Or would a better build be to group cards together with SLI/Crossfire?</p>

<p>If one of these cards generally gives 1200mhash, would i be correct to assume that 7 would give me 8400? Or is there some overhead issue here I'm not aware of?</p>

CC BY-SA 3.0
2013-11-15T13:34:54.380Z
don't do it.. not worth it. Get a Block Erupter 333MH USB stick if you want to play miner. Even those are not worth the investment anymore, but at least you're not wasting 3000W of power.
Jannes
CC BY-SA 3.0
2013-11-15T17:09:15.443Z
this is a setup for litecoin mining, not bitcoin.
netbrain
CC BY-SA 3.0
2013-11-22T02:49:38.597Z
Well, perhaps you want to mention that in your question then. ;)
Murch
CC BY-SA 3.0
2014-03-05T19:09:53.927Z
And you shouldn't assume so much :)
netbrain
<litecoin><miner-configuration><gpu-mining><mining-setup>
How to physically configure graphic card for higher yields?
netbrain
# How to physically configure graphic card for higher yields?

(Asked by: username_0 on 2013-11-15)

If I were to purchase a motherboard with 7 pci-ex ports. Could I then attach 7 graphic cards and run 7 cgminer processes? One for each card?

Or would a better build be to group cards together with SLI/Crossfire?

If one of these cards generally gives 1200mhash, would i be correct to assume that 7 would give me 8400? Or is there some overhead issue here I'm not aware of?

**Tags:** litecoin, miner-configuration, gpu-mining, mining-setup

> **Comments:**
> **username_1**: don't do it.. not worth it. Get a Block Erupter 333MH USB stick if you want to play miner. Even those are not worth the investment anymore, but at least you're not wasting 3000W of power.  
> **username_0**: this is a setup for litecoin mining, not bitcoin.  
> **username_2**: Well, perhaps you want to mention that in your question then. ;)  
> **username_0**: And you shouldn't assume so much :)  

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## 1 answers

### Answer by username_3 on 2013-11-16. Score: 2 | Accepted answer

A single instance of cgminer handles multiple GPUs, so there is no need to run separate processes. Enabling SLI(You aren't using NVIDIA cards, right...) or Crossfire will decrease mining performance, so leave it off.

There is no overhead associated with running multiple GPUs on a single system, unless the cards are physically spaced so close together that they overheat and throttle. 7 1.2 Mh/s cards would be expected to produce 8.4 Mh/s total.

At this point, investing in new GPUs for mining is questionable, and you should only consider GPU mining for scrypt-based altcoins such as Litecoin, as ASICs have made GPUs unviable for bitcoin mining.


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