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Mining - 7950 vs 7970

post #1 of 20
Thread Starter 
Ive been back in forth on which graphics card to buy as some people I am chatting with have different opinions.
I am looking to Mine solely with the cards. Probably Litecoins or an Alt coin.

I am looking to put together 1 rig for now and spend around $1,500. I was approved for up to $2,000 on Newegg preferred where I wouldn't have to pay for any of it for a year, which is just enough time for it to pay itself.

Going to use a UBS as the Hard Drive and was planning on picking up a cheap Mobo and CPU (Probably Intel). The PSU will be determined by the video cards either a Seasonic 850 or 1050-1200w depending.

So the big questions is....

3x 7970's Cards ..or
4x 7950 Cards

Both options run about the same price, but the power consumption and Hash rate are slightly different.

Also is there any real difference per manufacturer? I am on fence with Sapphire and Gigabyte, as the Gigabyte is $20 each per card but have 3 fans, while the Sapphire have only 2 and are the same price after a $20 MIR, but I believe sport a slightly higher memory base/boost. Looking at the 7970's when I say this.

Just trying to figure out which one would generate the most profit, so items like power usage and hash are important to me.. I can close them all off in a spare room, but the room kinda gets hot as is. I would probably put them in a crate and maybe buy a $20 to blow at it..

I am looking to place the order soon, as I almost hit the submit button like 2 times now with a fully loaded cart.

I appreciate anyone's input on rig configurations.
Edited by JMattes - 7/17/13 at 8:43am
post #2 of 20
OP what monitor resolution are you going to be running. also is it for single or multi monitor gaming. what are you going to use the cards for - gaming , folding , mining
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post #3 of 20
This is for mining, not gaming.
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post #4 of 20
More kh/s with 4x7950 for about the same price as 3x7970.
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post #5 of 20
Quote:
Originally Posted by bluestang View Post

More kh/s with 4x7950 for about the same price as 3x7970.

But more cost on power thumb.gif
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post #6 of 20
A cheap motherboard for 4-way crossfire? Not gonna happen. 3-way crossfire is really the limit on increased performance. Adding a fourth GPU may give you 10% better framerates in games. You're probably best off with 3 7970s, since that lets you save a bit on the PSU too. The biggest difference in manufacturers tends to be QC, cooling, and warranties. If I had no budget, I'd pick the card with the best stock cooling.
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post #7 of 20
Thread Starter 
Quote:
Originally Posted by raghu78 View Post

OP what monitor resolution are you going to be running. also is it for single or multi monitor gaming. what are you going to use the cards for - gaming , folding , mining

Thanks for the quick response. I thought for the section it was in that it was a given that it was for mining.

But I guess if you clicked the link from the first page you are right that it wasnt properly noted.

I revised the OP
post #8 of 20
also, by going with 4 7950's, if one goes down for whatever reason there is less of a drop in production.

Card model is more important than you would think, don't just jump at the cheapest one you can find. Read up on their mining performance by searching the model number followed by mining. Some cards are also much more OC friendly than others, which is probably important to you if you are building such an expensive rig solely to mine.

And last but not least, don't take one person's results as enough justification to assume you will get the same exact results. Even cards of the same model aren't created equally, although you can use other miners settings and results as a good baseline to figure out what you will get.

I'm assuming you are referring to the SAPPHIRE 100352-3L? I wouldn't overly recommend or not recommend it considering it is the cheapest card on Newegg and I have not encountered any problems with mine. But at the same time, I only have a single card in my case, so it might run a bit hot when thrown in with 3 other cards, considering the heatsink/fan apparatus is somewhat minimal comparative to other models of the 7950 series.

the black enclosure with the silver part on the corner is all cheap plastic, the actual cooling is done by the copper underneath it
Edited by 77bigmac77 - 7/17/13 at 8:56am
post #9 of 20
Thread Starter 
They are all within $20 or so. I actually didnt know they were the cheapest (kinda) and it wasnt why I was going with them.

Most people either go for the Powercool, Gigabyte, or the Sapphire from what Ive been seeing.

But the sole reason for this post is to get more than 1 persons opinion. So far there hasnt been much advice given.
post #10 of 20
I would go with the 4 7950's. You will make a little more money, and the 7950's use less power per Khash/s, so you'll be spending less per card on your electric bill.

Is this build going to be inside a case or on a bench or milk-crate? I recommend not using a case so the cards can have better airflow. You also don't need a motherboard with 4 PCIe x16 slots, you just need one that has 4 of any size PCIe slots. You can use PCIe riser cards to install the cards on the PCIe x1 slots.
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