Topic: Powercolor 7870 LE (Tahiti) - NEED HELP! - page 2. (Read 14170 times)
^ That is the card. Please update on your experience with it.
Could you post a link to the specific cards that were purchased?
Oh well... I have 3 of them mining away on a board for right this second. They are going back to Newegg on monday though. Wonder if they'll give me shit since I haven't game tested them?
good choice
Oh well... I have 3 of them mining away on a board for right this second. They are going back to Newegg on monday though. Wonder if they'll give me shit since I haven't game tested them?
I've yet to have an issue with returns to NE, always a first though. Good luck!
Oh well... I have 3 of them mining away on a board for right this second. They are going back to Newegg on monday though. Wonder if they'll give me shit since I haven't game tested them?
All my GPU's mine perfectly with a slight core OC, under clocked Memory and undervolted. Upping the Memory speed doesn't do anything but raise heat levels for me.
7970,6950,5850 and 6870's. I use cgminer.
7970,6950,5850 and 6870's. I use cgminer.
KWH we are talking about litecoin and scrypt here, not bitcoin.
LTC is what I mine. Assume much?
All my GPU's mine perfectly with a slight core OC, under clocked Memory and undervolted. Upping the Memory speed doesn't do anything but raise heat levels for me.
7970,6950,5850 and 6870's. I use cgminer.
7970,6950,5850 and 6870's. I use cgminer.
KWH we are talking about litecoin and scrypt here, not bitcoin.
All my GPU's mine perfectly with a slight core OC, under clocked Memory and undervolted. Upping the Memory speed doesn't do anything but raise heat levels for me.
7970,6950,5850 and 6870's. I use cgminer.
7970,6950,5850 and 6870's. I use cgminer.
Nope, nope, and nope... Massive hardware errors when any intensity over 13 is tried no matter core or memory settings.
Interestingly if I downclocked the core to 725mhz it increased the hash rate to 315kh/s... Downclocking memory had detrimental effect after hitting below 1400mhz
Try 725 MHz and 1500 MHz RAM, intensity 14, 16, and 18
There may just not be enough memory bandwidth for that many shaders
I've tried 128...
I have a 7970 diamond mining at stock clocks and 520kh/s.... Its not a 7000 series problem... This is just a POS powercolor problem
Lol.
Anyways, I flashed to the MYST bios and no luck. I'm gonna try and flash to a sapphire XT bios. If that doesn't work I'm gonna just chalk it up to Powercolor buying some of the most crappily binned tahiti cores it could find and then shipping the finished product to unsuspecting customers.
On a possibly related note, I did ran the GPU-z ASIC quality test on one of the cards and it got a 59%... Maybe its the high stock clock (925 core and 1500 mem)...
I have a 7970 diamond mining at stock clocks and 520kh/s.... Its not a 7000 series problem... This is just a POS powercolor problem
Lol.Anyways, I flashed to the MYST bios and no luck. I'm gonna try and flash to a sapphire XT bios. If that doesn't work I'm gonna just chalk it up to Powercolor buying some of the most crappily binned tahiti cores it could find and then shipping the finished product to unsuspecting customers.
On a possibly related note, I did ran the GPU-z ASIC quality test on one of the cards and it got a 59%... Maybe its the high stock clock (925 core and 1500 mem)...
This is the reason why I gave up litcoin mining couple months back. Couldn't get my 7000 series cards anywhere near what some people reported, or close enough to what I get with bitcoin mining (550Mh/s ~ 550Kh/s).
interesting, did you try to change -w to 128 or 64? and try to keep the core/memory ratio to about 0.7
Should also mention I'm running 13.1 drivers... gonnna try the 13.3 beta drivers
No go on changing any options. Couldnt get cgminer to start with: setx GPU_MAX_ALLOC_PERCENT_100
Reaper crashes with intensity over 13 or so as well.
Deleting all options except -i 13 gave me about 300kh/s
Interestingly if I downclocked the core to 725mhz it increased the hash rate to 315kh/s... Downclocking memory had detrimental effect after hitting below 1400mhz
I initially tested 2 cards together on 1 board with 4gb of ram. (I run 3 5970s on the same type of board with only 4gb and get standard hash rates). I then tested only 1 card on the 4gb board. Then tested another card on a different board with 2gb... Got the same results.
I can't flash bios as RBE doesn't recognize any 7800 series bios... ATIwinflash won't let me flash either. I believe the bios is locked.... I'm just about through messing with these mother fuckers...
Gonna enjoy having to send them back to newegg. Hopefully they don't charge me a restocking fee.
Any other suggestions would be appreciated but at this point I don't think there is much else to try.
Reaper crashes with intensity over 13 or so as well.
Deleting all options except -i 13 gave me about 300kh/s
Interestingly if I downclocked the core to 725mhz it increased the hash rate to 315kh/s... Downclocking memory had detrimental effect after hitting below 1400mhz
I initially tested 2 cards together on 1 board with 4gb of ram. (I run 3 5970s on the same type of board with only 4gb and get standard hash rates). I then tested only 1 card on the 4gb board. Then tested another card on a different board with 2gb... Got the same results.
I can't flash bios as RBE doesn't recognize any 7800 series bios... ATIwinflash won't let me flash either. I believe the bios is locked.... I'm just about through messing with these mother fuckers...
Gonna enjoy having to send them back to newegg. Hopefully they don't charge me a restocking fee.
Any other suggestions would be appreciated but at this point I don't think there is much else to try.
Are you running 4 cards all together and each get 330Kh/s
I might be wrong, but if you are mining LTC with 4G of RAM and 4 7870 cards, it's not a good combination.
I personally use 3 powercolor 7950, the max -I is 13 higher than this will product massive HW......so I guess you don't need to bother this parameter
you don't need --thread-concurrency 8192, my cards all mining at 510Kh/s just fine without it.
so I can only conclude that increase your system RAM to 6 or 8G, and see if hashrate increases
I might be wrong, but if you are mining LTC with 4G of RAM and 4 7870 cards, it's not a good combination.
I personally use 3 powercolor 7950, the max -I is 13 higher than this will product massive HW......so I guess you don't need to bother this parameter
you don't need --thread-concurrency 8192, my cards all mining at 510Kh/s just fine without it.
so I can only conclude that increase your system RAM to 6 or 8G, and see if hashrate increases
Thanks for the suggestions guys. Will try when I get home and update.
Since its a tahiti, try running 950/100 thread concurencies 24000 - these tahiti chis really dont have a pattern for ltc, every card is different
i'd return them...that 7970 powercolor i had...sent it to rma and the card they gave me back worked for a whole 4 days mining btc before it quit...just sent it out today for another rma...powercolor is just shit imho...hopefully 3rd times a charm with this company...good luck to you
If you search the cgminer thread there is a setting you can enter in a CMD window. setx GPU_MAX_ALLOC_PERCENT_100 or something similar. Check there for the exact setting, you dont want to use something else.
That will fix the CGMiner not starting with higher thread concurrencys if you are using 11.3.
That will fix the CGMiner not starting with higher thread concurrencys if you are using 11.3.
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