6x Sapphire R7 240s ... why not? 635k/hash for under 250w

A

alumar

[H]ard|Gawd
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Feb 9, 2002
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For those interested in mining ... These sapphires can be picked up for 35-40 bucks on ebay... for folks with limited power and want to hedge on some doge might be a cheap solution to enter the game.

Machine Build:

MB: ASROCK H81 Pro BTC (57.99) ~ at microcenter if in stock, otherwise 150+ on ebay
CPU: Intel G3220 Haswell (49.99)
MEM: (1) 4gb Cosair Ballistix 1600mhz (37.00)
HD: PNY 120gb SSD (Microcenter for 39.99 after rebate)
Risers: 5x 1x to 16x (any work, happened to get 5 of them for 40 bucks on the bay)
PSU: Corsair CX600 (39.99 microcenter deal)
GPU: Sapphire R7 240's (35 each on ebay) ... OC'd to 950/1000

Total system AC via Killawatt - 248w from wall

Bottom line: 635k/h @ 140w (just cards) for 35x6 = 210 bucks

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Too clean. Need more wires and stuff over the place.

The funny part is those USB risers prolly cost a good $20-30 each:D

Nice job.
 
This is an interesting idea and it looks extremely pleasant!
Way to go :-D
 
I'm not one for mining but I think your setup is amazing. Way to use some available cards for almost nothing in terms of an initial investment.
 
Actually, the USB risers are much cheaper than they use to be even a month ago.

Chinatec factor is dropping them under $20!

I will caution however that getting 6 cards to mine at the same time is at times no easy thing.
 
Thanks for the kind comments! It was more of an experiment and I am actually building a smaller open air case for the entire setup (was using a larger rig, built for 6x 280x+ cards ...)

Here's a quick shot of that gem in the same rig:

6x Sapphire R9 280x Toxics
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However, the R7 240's surprised me ... very efficient with the power and 106k/h is not bad from that card at all. Next up is 6x nVidia 750Ti .... these are the new dark horses in the Cryptocurrency mining arena ... going to see if nVidia can muster up a fight in the price/killawatt
 
Nice. I've only seen ribbon style riser before. Those USB cables are neat.
 
Great job. Would love to see stats in terms of best rig for khash/$, khash/W, khash/rig, etc.
 
This looks amazing, but then I think about how all those 280x's could be gaming right now. :p
 
mi7chy said:
Great job. Would love to see stats in terms of best rig for khash/$, khash/W, khash/rig, etc.
Click to expand...

Properly tweaked 270xs are the best Kh/$ setup hands down. The numbers people are clinging to from that Tom's review are useless. Cudaminer comes pretty nicely tweaked out of the box for Nvidia cards whereas CGminer does not and most are not using CGminer anymore anyways, a 270x using SGminer can do 460+Kh/s easily.

Some napkin numbers:

270x = 460+Kh/s, 6x rig = 2.7+Kh/s@$240 each(http://www.newegg.com/Product/Product.aspx?Item=N82E16814550027) = $1440 or 1.9+Kh/$

750ti = 245Kh/s, 6x rig = 1.47Kh/s@$150 each(http://www.newegg.com/Product/Product.aspx?Item=N82E16814487025) = $900 or 1.63Kh/$

The problem with the 750tis is their density is simply horrible. You would have to buy 2 rigs with twice the number of cards (11 actually) to match what 1 single rig using 270x's gives you. That means twice the rack space/another chasis, another PSU, another motherboard, another CPU, another set of memory sticks, another hard drive. You could save on not buying extra hard drives if running linux out of a small USB drive but then again a 270x rig wouldn't have that expense either.
 
Lorien said:
Properly tweaked 270xs are the best Kh/$ setup hands down. The numbers people are clinging to from that Tom's review are useless. Cudaminer comes pretty nicely tweaked out of the box for Nvidia cards whereas CGminer does not and most are not using CGminer anymore anyways, a 270x using SGminer can do 460+Kh/s easily.

Some napkin numbers:

270x = 460+Kh/s, 6x rig = 2.7+Kh/s@$240 each(http://www.newegg.com/Product/Product.aspx?Item=N82E16814550027) = $1440 or 1.9+Kh/$

750ti = 245Kh/s, 6x rig = 1.47Kh/s@$150 each(http://www.newegg.com/Product/Product.aspx?Item=N82E16814487025) = $900 or 1.63Kh/$

The problem with the 750tis is their density is simply horrible. You would have to buy 2 rigs with twice the number of cards (11 actually) to match what 1 single rig using 270x's gives you. That means twice the rack space/another chasis, another PSU, another motherboard, another CPU, another set of memory sticks, another hard drive. You could save on not buying extra hard drives if running linux out of a small USB drive but then again a 270x rig wouldn't have that expense either.
Click to expand...

Gets a little muddier when you factor in power usage however and in all actuality the 750ti's are doing much better than 245k/h. We picked up one yesterday and with little to no tweak here are the results: Total system power 117w under full load (65w of that is the card) performing at a strong 279.x k/h. Minor tweaking increases wattage useage by + 23 to a total system power of 140w however hashes go to 320+ ... for 169.xx card

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Ohh nice!, that makes them a bit more interesting though I see the card is overclocked (my napkin math used stock clocked cards). Are you planning on picking up more cards to complete the set of 6 or is that single 750ti just for testing? Looking forward to seeing your results. :)
 
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