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Buying used HD 7970s that were bitcoin miners? - Page 3

post #21 of 60
DOH!

(watercooling)
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post #22 of 60
AMD reference cards are nearly indestructible.

All of my reference cards that have been mining for 1.5 years still do the same overclocks as when they were purchased.

He's just selling them because of the profitability drop of GPU mining, especially if you pay the elect. bill.
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post #23 of 60
Quote:
Originally Posted by iamhollywood5 View Post

I don't understand that. I know you understand ASIC quality better than most people, but is there a scientific explanation as to why a GPU that requires less voltage than another to reach 925Mhz wouldn't also require less voltage than another to reach 1300Mhz?

In my experience with the 7 different low-ASIC 7970s I've tried (53% to 69%), all of them seemed to have extremely-little to NO voltage scaling at all, with increased voltages having virtually no effect on maximum stable overclock even when under 70C.

What it sure sounds like is that ASIC quality has absolutely no relation to a card scaling or not scaling with voltiage---its either luck of the draw or something else hardware related on the card.

What it seems like is that a too low voltage will cause the card to crash completely (VPU recover/display driver crash), while a higher voltage -may- stop the crashing, but wont affect where artifacts occur (which may lead to a crash also if it gets too severe)..
There was discussion about this a year ago. People were saying that many of the cards have a -temperature- wall, and once you bypass that, you will start getting artifacts, regardless of the voltage. But if you keep the card cool, then it may scale.
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post #24 of 60
Quote:
Originally Posted by grunion View Post

AMD reference cards are nearly indestructible.

All of my reference cards that have been mining for 1.5 years still do the same overclocks as when they were purchased.

He's just selling them because of the profitability drop of GPU mining, especially if you pay the elect. bill.

This.

My card spent about two months on air mining 24/7, damn thing hit ~75-80c depending on ambient. Now its under water and not breaking 50c, but the two months of "torture" didn't hurt it and it still OC's just as well as when I got it.

Keep in mind these cards are tested to work in "regular" computer cases and hit much higher temps then most of us enthusiasts with high end cases and tons of fans will see.
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post #25 of 60
You shouldnt buy a biinned card for mining. Almost any card with 80% asic quality hit volt wall around to 1.2 volt. You want to watercool so you want a card to scale all over to 1.35. If you want to bin a card search for 70-75%.
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post #26 of 60
Just look at it financially: How much is the risk worth? Around 40% of its value? Then buy them only if they are at least 60% of their initial value. etc.
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post #27 of 60
I know the auctions you're talking about. He has the Asic qualities of each card shown in the pictures. Get the one that had like 62%. That one will be best for water-cooling.
post #28 of 60
Quote:
Originally Posted by ucantescape1992 View Post

I know the auctions you're talking about. He has the Asic qualities of each card shown in the pictures. Get the one that had like 62%. That one will be best for water-cooling.


62% is bit low for water. 60% asics are more for extreme cooling setups with modded cards that can apply more voltage and bypass OCP.

Quote:
Originally Posted by sugarhell View Post

You shouldnt buy a biinned card for mining. Almost any card with 80% asic quality hit volt wall around to 1.2 volt. You want to watercool so you want a card to scale all over to 1.35. If you want to bin a card search for 70-75%.


^^This is what ya want for regular old watercooling.
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post #29 of 60
To be honest man I would not buy it The following reasons are I will list the good and the bad and it as simple as that!

REASONS NOT TOO!
[*] the card has been through allot ! ( it has been running 24/7 at 70c now that is harsh !!!!
[*] the thermal paste has already set in so its prob a gone er and needs to be replaced
[*] mining on those cards is really hard on the memory!
[*] I have mined on a 7950 Before and after 1 month black dots everywhere in games!
[*] the seller says NO RETURNS ! SO that means hes not 100% confident in his used stuff!
REASONS WHY YOU SHOULD
[*] the card is stated to be working ( for now but how about in the long run? ) it would have no warranty and such so really its best to get a new one that has a warrenty!
[*] it is cheaper then a new one prob



=ROG
post #30 of 60
If he provides a purchase receipt, so that you can do an RMA in case you ever need it, go for that card, there's no reason not to get it as long as you have the ability of starting an RMA in case it ever fails on you, which I doubt they will specially if they were on stock and undervolted...

One of my cards (The Sapphire) has had 2 previous owners, both whom I know in real life, and they both used to run it at 1200/1700 at 1.289mV on MSI Afterburner (So like 1.24v if you count vdroop), one of them used it for bitcoin for over a year and it still works great as the first day. thumb.gif

TL;RD:

If it has a purchase receipt: Buy it
If it does NOT have a purchase receipt: Stay away from it
    
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