Bitcoin Forum

So I recently picked up two of these babies http://www.newegg.ca/Product/Product.aspx?Item=N82E16814131471

On paper they seem like the greatest thing since sliced bread however I have had so many issues with them.

The overclock on it is so high that when doing BTC mining it'll cause a reboot after a minute.

What programs are used for handling the overclocking (or in this case underclocking) and what are recommended settings for Core/Mem/Voltage?  I was using Trixx but I'm not sure if that works with these new cards.

Don't forget to disable ULPS. Also 12.3 seems to be the best set of drivers for multi-card mining right now.

UPLS?

Dal

Reboot? It shouldn't do that. It should cause a driver crash and recover, or worst case, freeze. Reboot seems to point to a power supply problem.

Google "Disable ULPS" (https://www.google.com/search?q=Disable+ULPS)

Before trying anything make sure your power supply is powerful enough to run the cards. Stress the PSU to much and the PC reboots when there simply isn't the wattage available for the load.
If you haven't, get them 100% stable with no overclocking because....... A reboot sounds like a PSU issue.


Does this issue occur with only 1 card mining and the 2nd removed from the system?

Sorry by reboot I chose the wrong word for that.  I meant it would go to a black screen and lock up.

Black screen.. I also encounter this problem on specific cards, or at least I'm assuming this as I only have VNC access to some. It usually only happens to me if a card is unstable at a certain frequency, either due to lack of power or excess of heat in combination with high clocks, and has difficulty recovering. Out of 13 cards, 2 of them have some difficulty recovering. One of them causes the screen to freeze and entire rig is unresponsive, but is capable of high clocks at low volts (Diamond 5830 @ 885 core and 0.95v). The other goes to a black screen instead and PC is unresponsive (Sapphire 5830 extreme @ 705 core and 0.95v).

To rule out some sort of power problem, can you see if you can run furmark on all gpus, possible by extending desktop and dragging furmark window the new "monitors"? Use vga dummy plugs if you have to. I found that I get a consistently larger power draw with furmark than with bitcoin mining, and it should rule out mining-specific problems.

I know the PSU is always emphasized when looking at issues.  I honestly believe that the cards just need a little more voltage to keep their clocks stable for mining (as opposed to gaming).  They come default 1100 Core so you can imagine the strain it is under mining.

I currently have a OCZ 1000W so unless I'm using the wrong rail for one of the cards it should be more than enough.

Just thought I'd update this I'm back to having an issue.

These cards are fine for gaming, no problems at all (stock clocks at 1100Core 1450Mem) however when I mine even when underclocked for the sake of not going deaf (900Core/600ish Mem) I can mine for a few minutes then suddenly I go to a black screen and have to hard reset the PC.

I am starting to think maybe it is the power supply but I'd prefer to get a more expert opinion on this before I go out and drop like $200 for a 1200 Watt vs my 1000Watt already.

I have an OCZ ZX1000W

I'm retarded I solved my own issue. I found a review with the proper power reading that sits at 550 each.  So I do need to upgrade....Now this PC sits on a regular 120V for a house in North America.  If I get like a 1200W+ PSU will I burn the house down?

I hope you're not referring to this (http://www.tweaktown.com/reviews/4679/powercolor_pcs_radeon_hd_7970_3gb_vortex_ii_overclocked_video_card_review/index17.html) because they have a 7750 consuming more power than a 7850.  *face palm*

The card is going to consume ~200W at stock settings.  Much less when you lower the core/memory and voltage.

Try testing each card individually with 3DMark11 and/or Heaven D11 Benchmark.  I highly doubt that the PSU is the problem unless it was faulty from the start.

Yeah that's what I was looking at I honestly thought it is odd that a 1000W can't power just two cards.  It isn't faulty since I was running 2x 6950's up until a few days ago when I swapped them out to try these.  I really want to use them but they keep causing my PC to drop to a black screen.  I'll try running with only 1 card tonight if it survives then I believe the PSU isn't keeping up.