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How much are used 7950s going for? - Page 2  

post #11 of 13
Quote:
Originally Posted by Blameless View Post

Mining hasn't died, but GPUs are considerably less profitable now than they were.
GPU can just as easily be abused in other uses. Most miners were after profitability, and pushing a part too far dramatically lowers it performance per watt, so is rarely done by serious miners. Also, mining GPU are not subject to the sort of thermal expansion and contraction that most are, because they tend to be loaded 24/7.

All in all, I expect the overall average quality between used mining and non-mining GPUs to be similar. Still, it's always wise to get detailed pictures and a guarantee against DOA/early failure.


I would think the fan would die out pretty fast on cards that were mined on.
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post #12 of 13
Quote:
Originally Posted by Blameless View Post

Mining hasn't died, but GPUs are considerably less profitable now than they were.
GPU can just as easily be abused in other uses. Most miners were after profitability, and pushing a part too far dramatically lowers it performance per watt, so is rarely done by serious miners. Also, mining GPU are not subject to the sort of thermal expansion and contraction that most are, because they tend to be loaded 24/7.

All in all, I expect the overall average quality between used mining and non-mining GPUs to be similar. Still, it's always wise to get detailed pictures and a guarantee against DOA/early failure.

When I said Abused, i meant Physically as well, I've seen some of these 16 card Milk Crate mining rigs.... I meant check pix, be weary of any large scratches, or damage to the fans/shroud/pcb from bein dropped or jury rigged to a non standard mounting.

I've seen a lot of ads online for LOTs of GPUs, and I've seen ads for GPUs fresh from RMA (as they wanted to get it replaced under warranty before selling).

Some look great, but I've seen some with cracked fan blades and cracked PCBs (like they over tightened the screws when they re-mounted the stock cooler)...

It's not prophitable anymore because 'seeds use 10-15w and put out the same KH/s via USB.

So a Single Mainboard is only limited by USB Ports (usually 10-15) and not buy PCI-e Slots.

So.. 6 mainboards running 6 cards with PCI riser cables and chewing 10,000w turns into a few mainboards and USB Hubs running small 3x3x2 'seeds using maybe 750watts for the same hashrate.

Dropping from $30/day (avg) to about $1.50/day operating cost.
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post #13 of 13
Quote:
Originally Posted by Shiftstealth View Post

I would think the fan would die out pretty fast on cards that were mined on.

The fans tend to last quite a while.

I have a batch of cards that have been running at 80-100% fan speed for over three years, virtually 24/7, at this point, and only one is showing any signs of problems. The newer cards with less time on them are in completely pristine shape.
Quote:
Originally Posted by SkateZilla View Post

When I said Abused, i meant Physically as well, I've seen some of these 16 card Milk Crate mining rigs.... I meant check pix, be weary of any large scratches, or damage to the fans/shroud/pcb from bein dropped or jury rigged to a non standard mounting.

I've seen a lot of ads online for LOTs of GPUs, and I've seen ads for GPUs fresh from RMA (as they wanted to get it replaced under warranty before selling).

Some look great, but I've seen some with cracked fan blades and cracked PCBs (like they over tightened the screws when they re-mounted the stock cooler)...

I'd think that physical damage was the exception rather than the rule, but this one of the reasons why I suggested getting pictures before committing to anything.
Edited by Blameless - 4/30/14 at 1:14pm
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