Hacked Modified Memory Strap BIOS Database for ZEC MINING! - page 10.

I got 1 of these. Its actually the fastest ZEC GPU I have. Faster than the 280x. It has Hynix MFR memory. No idea how it differs from the 7950 reference but its technically a 8950.

You should EASILY get 85 Sol/s with that GPU. Its actually the only 7950, that runs stable at 1100/1575.

İ have the sama card. flashed twaeked bios 1100/1575 gave 160h/s is it normal?

Yeah its slower now than the 7970/280x with Claymore V7.

With previous versions, it was the fastest GPU due to the way it handled the memory operations.

Flashing the modded BIOS doesn't do anything for Claymore V7, but if you go back to ETH, you will get like 0.5-1.0MH/s boost in speed compared to stock bios.

If it hashes better on v6 then run v6 on that card alone. v7 on the other cards.

adaseb

legendary

Activity: 3808

Merit: 1723

Quote from: fenomenhaa on November 19, 2016, 02:56:37 PM

Quote from: adaseb on November 11, 2016, 09:25:03 AM

I got 1 of these. Its actually the fastest ZEC GPU I have. Faster than the 280x. It has Hynix MFR memory. No idea how it differs from the 7950 reference but its technically a 8950.

You should EASILY get 85 Sol/s with that GPU. Its actually the only 7950, that runs stable at 1100/1575.

İ have the sama card. flashed twaeked bios 1100/1575 gave 160h/s is it normal?

Yeah its slower now than the 7970/280x with Claymore V7.

With previous versions, it was the fastest GPU due to the way it handled the memory operations.

Flashing the modded BIOS doesn't do anything for Claymore V7, but if you go back to ETH, you will get like 0.5-1.0MH/s boost in speed compared to stock bios.

fenomenhaa

sr. member

Activity: 248

Merit: 250

Quote from: adaseb on November 11, 2016, 09:25:03 AM

I got 1 of these. Its actually the fastest ZEC GPU I have. Faster than the 280x. It has Hynix MFR memory. No idea how it differs from the 7950 reference but its technically a 8950.

You should EASILY get 85 Sol/s with that GPU. Its actually the only 7950, that runs stable at 1100/1575.

İ have the sama card. flashed twaeked bios 1100/1575 gave 160h/s is it normal?

adaseb

legendary

Activity: 3808

Merit: 1723

Quote from: AmDD on November 18, 2016, 10:27:00 PM

Quote from: adaseb on November 18, 2016, 10:24:23 PM

Quote from: AmDD on November 18, 2016, 10:19:26 PM

Quote from: adaseb on November 18, 2016, 04:19:55 PM

With Claymore V7 some of my GPUs have slowed with the modified bios's, some are faster, some are faster being stock.

Best is the reference R9 290 running at 230 h/s.

Anyone else can report.

Damn! Those things are tanks.... too bad I dont own any.

What are you getting with your 7950's now? and what CPU? I run a Sempron with 5-6 per rig which I know hurts me some.

7950 are ~155.

Im pushing about 112 average on optiminer and ethos. Not all my cards would run on the tweaked memory timings, maybe the newest update will get me closer to that number.

Yeah I am getting 155 with a stock factory bios.

AmDD

legendary

Activity: 1027

Merit: 1005

Quote from: adaseb on November 18, 2016, 10:24:23 PM

Quote from: AmDD on November 18, 2016, 10:19:26 PM

Quote from: adaseb on November 18, 2016, 04:19:55 PM

With Claymore V7 some of my GPUs have slowed with the modified bios's, some are faster, some are faster being stock.

Best is the reference R9 290 running at 230 h/s.

Anyone else can report.

Damn! Those things are tanks.... too bad I dont own any.

What are you getting with your 7950's now? and what CPU? I run a Sempron with 5-6 per rig which I know hurts me some.

7950 are ~155.

Im pushing about 112 average on optiminer and ethos. Not all my cards would run on the tweaked memory timings, maybe the newest update will get me closer to that number.

adaseb

legendary

Activity: 3808

Merit: 1723

Quote from: AmDD on November 18, 2016, 10:19:26 PM

Quote from: adaseb on November 18, 2016, 04:19:55 PM

With Claymore V7 some of my GPUs have slowed with the modified bios's, some are faster, some are faster being stock.

Best is the reference R9 290 running at 230 h/s.

Anyone else can report.

Damn! Those things are tanks.... too bad I dont own any.

What are you getting with your 7950's now? and what CPU? I run a Sempron with 5-6 per rig which I know hurts me some.

7950 are ~155.
7970/280x are ~175-180

AmDD

legendary

Activity: 1027

Merit: 1005

Quote from: adaseb on November 18, 2016, 04:19:55 PM

With Claymore V7 some of my GPUs have slowed with the modified bios's, some are faster, some are faster being stock.

Best is the reference R9 290 running at 230 h/s.

Anyone else can report.

Damn! Those things are tanks.... too bad I dont own any.

What are you getting with your 7950's now? and what CPU? I run a Sempron with 5-6 per rig which I know hurts me some.

reb0rn21

legendary

Activity: 1901

Merit: 1024

Quote from: adaseb on November 18, 2016, 10:16:04 PM

Yeah but running Tahiti at 1200mhz engine will require overvolting. Not worth it.

yeah, just for test...
tahiti GPU is just weak for blake and zcash to use full memory speed with 384bit bus, maybe only if more optimization can be done to blake on GCN 1.0

adaseb

legendary

Activity: 3808

Merit: 1723

Yeah but running Tahiti at 1200mhz engine will require overvolting. Not worth it.

reb0rn21

legendary

Activity: 1901

Merit: 1024

Quote from: adaseb on November 18, 2016, 09:17:29 PM

Claymore V7 seems more Engine clock tuned rather than memory.

Basically all my 7950s are slower than my 7970/280x.

Memory straps do very little now. Just set your core clock as high as you can to get the most performance.

Now memory usage is better and for +160 sol/s you need more GPU power, duno if blace can be optimized more but for ~200sol/s you need +1200Mhz from tahiti 280x and prolly more from 7950 because it has less shaders

oslak

sr. member

Activity: 273

Merit: 250

Quote from: adaseb on November 18, 2016, 09:17:29 PM

Claymore V7 seems more Engine clock tuned rather than memory.

Basically all my 7950s are slower than my 7970/280x.

Memory straps do very little now. Just set your core clock as high as you can to get the most performance.

After several instacrash on v7,i undervolt and underclock. Still hashing better than v6.
http://imgur.com/a/zo9To

adaseb

legendary

Activity: 3808

Merit: 1723

Claymore V7 seems more Engine clock tuned rather than memory.

Basically all my 7950s are slower than my 7970/280x.

Memory straps do very little now. Just set your core clock as high as you can to get the most performance.

JuanHungLo

hero member

Activity: 935

Merit: 1001

I don't always drink...

Using the same concepts applied in this thread I modded a 380 ROM in an XFX 380 DD, using Claymore 7.0 at stock 1040/1500 it is now getting 120 Sol/s. Not a huge improvement, but about 4-5%.

Wolf0

member

Activity: 81

Merit: 1002

It was only the wind.

Quote from: nerdralph on November 16, 2016, 11:43:51 AM

Some people don't seem to realize that ZEC mining puts very different demands on your card than ETH mining. ETH mining is 100% memory reads, while ZEC mining, depending on the kernel code, can have more writes than reads. When you modify BIOS straps for ETH mining, you might be using read-write turnaround timing that will cause write errors. Then when someone gets errors or GPU hanging on ZEC mining, they blame the software when their BIOS mod is the issue.
A BIOS guru (not me) can create custom straps that tune each relevant timing value to their safe limits.
The following product brief shows a few of the parameters for DDR5 RAM. For full details see a datasheet.
https://www.micron.com/~/media/documents/products/data-sheet/dram/gddr5/4gb_gddr5_sgram_brief.pdf

THANK YOU. I know how to, and I know read delays (ESPECIALLY because the reads in Eth are designed to be random, a pain in the ass) are not the BIGGEST issue when it comes to ZCash timings.

reb0rn21

legendary

Activity: 1901

Merit: 1024

That is why also on NV 1070 on ETH, memory overclock (samsug) can work +900 (afterburner) and on zcash same card/rig only 600-650, all over is unstable

Topic: Hacked Modified Memory Strap BIOS Database for ZEC MINING! - page 10. (Read 78516 times)