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Author Topic: 3x 7950 rig check.  (Read 2522 times)
penta
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April 03, 2013, 12:11:17 PM
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So my local shops dont have the selection as newegg etc has i had to go with what parts i could find.


Gigabyte 990FXA-UD5   Only card i could see with spacing to fit 3 cards in a 7slot slot case without risers, other beeing asus formula cards but they were twice the price

3x Gigabyte HD 7950 3GB GDDR5  seems to have better cooling than the other cards and should fit fine? my other options are
       HIS HD 7950 IceQ Turbo 3GD5(100$ more)
       HIS HD 7950 Fan 3GD5(50$less)
       SAPPHIRE HD 7950 VAPOR-X 3GB GDDR5 (same price)
       SAPPHIRE HD 7950 3GB OC GDDR5 (50$less)

AMD FX-4100 Black Edition 3.6G cheapest am3 cpu i could find

2x Kingston DDR3 4GB 1600 8gb optimal for ltc mining?

case Tempest 210 120x2front/2x120side/2x140top should be enough?

XFX ProSeries 850W 850 should be enough? if not i have a corsair ax1200w i could use.

16gb flash stick






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April 03, 2013, 01:19:58 PM
 #2

So my local shops dont have the selection as newegg etc has i had to go with what parts i could find.


Gigabyte 990FXA-UD5   Only card i could see with spacing to fit 3 cards in a 7slot slot case without risers, other beeing asus formula cards but they were twice the price

3x Gigabyte HD 7950 3GB GDDR5  seems to have better cooling than the other cards and should fit fine? my other options are
       HIS HD 7950 IceQ Turbo 3GD5(100$ more)
       HIS HD 7950 Fan 3GD5(50$less)
       SAPPHIRE HD 7950 VAPOR-X 3GB GDDR5 (same price)
       SAPPHIRE HD 7950 3GB OC GDDR5 (50$less)

AMD FX-4100 Black Edition 3.6G cheapest am3 cpu i could find

2x Kingston DDR3 4GB 1600 8gb optimal for ltc mining?

case Tempest 210 120x2front/2x120side/2x140top should be enough?

XFX ProSeries 850W 850 should be enough? if not i have a corsair ax1200w i could use.

16gb flash stick

Warranties are important as you'll likely mine with this card until it dies. Especially in a 3 card non riser'ed system.

You can find cheaper AM3s than that, literally pick up some $40 thing.
8GB is a bit overkill still, even for litecoin. Its cheap so doesn't matter.

Try and find a case with a 200mm+ side fan, as you'll need the massive cooling for those GPUs.

850 should be fine, but dont expect it to last more than 2-3 years.

Buy a cheap 80GB refurbished hard drive from ebay, like $25. Same price as flash but can sit inside.

penta
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April 03, 2013, 01:33:42 PM
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good points, seems gigabyte has 3 year warranty
dogie
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April 03, 2013, 01:36:41 PM
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good points, seems gigabyte has 3 year warranty

You might be able to find even longer, although it varies by region. For example gainward offer a lifetime warranty when you register, and evga do on some of theirs. Its a great investment when your card melts after 5 years, you'll either get a refurbished one which is easier to sell than used, or credit, or an upgrade for free.

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April 03, 2013, 03:53:51 PM
 #5

8GB is a bit overkill still, even for litecoin. Its cheap so doesn't matter.

You need 8gb for high thread concurrency required by 79xx cards

Code:
XMR: 44GBHzv6ZyQdJkjqZje6KLZ3xSyN1hBSFAnLP6EAqJtCRVzMzZmeXTC2AHKDS9aEDTRKmo6a6o9r9j86pYfhCWDkKjbtcns
ryantc
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April 03, 2013, 05:02:22 PM
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reaper asks for 1.5g RAM for each 7950......

Consider HX 850, that's the PSU so far I found has 6 * 6 pins for 3 cards,  I am still digging
dogie
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April 03, 2013, 05:18:54 PM
 #7

reaper asks for 1.5g RAM for each 7950......

Consider HX 850, that's the PSU so far I found has 6 * 6 pins for 3 cards,  I am still digging


I have one, and it has 6 connectors with 8 pins each.

Marrs
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April 03, 2013, 09:19:41 PM
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8GB is a bit overkill still, even for litecoin. Its cheap so doesn't matter.

You need 8gb for high thread concurrency required by 79xx cards

Even with cgminer?
zif33rs
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April 03, 2013, 09:25:11 PM
 #9

Think 850w is enough for 3x 7950s?   I dont have a killawatt but I just got another 7950 for my system and the topbrand 700w I was using just couldnt substain both cards. It word shutdown after 20 minutes or so of mining. I replaced it with a 900w unit and have had zero issues. Dont skimp out on the powersupply. I would look into a 1200w unit myself.

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ryantc
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April 04, 2013, 12:57:28 AM
 #10

reaper asks for 1.5g RAM for each 7950......

Consider HX 850, that's the PSU so far I found has 6 * 6 pins for 3 cards,  I am still digging


I have one, and it has 6 connectors with 8 pins each.

I found two of this HX850 from the Internet,
One it says HX series HX850 the other one has Professional Series HX850,
and one is 80 Plus silver the other one is 80 Gold
I am confused......
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