Downgrade to SDK 2.1? | Bitcointalksearch.org

phelix

legendary

Activity: 1708

Merit: 1020

Quote from: Meatball on July 22, 2011, 09:33:23 PM

Same here with all my testing on 5770's, 5830's & 5850's. SDK 2.1 gives me approximately 4-6% faster hash rates than anything newer. Have tried 11.5, 11.6 & 11.7 drivers and both Win 7 x32 & x64 with the same result.

I'm using Poclbm through guiminer for my mining.

what about the new modified phatk? that should even it out.

Meatball

sr. member

Activity: 378

Merit: 250

Same here with all my testing on 5770's, 5830's & 5850's. SDK 2.1 gives me approximately 4-6% faster hash rates than anything newer. Have tried 11.5, 11.6 & 11.7 drivers and both Win 7 x32 & x64 with the same result.

I'm using Poclbm through guiminer for my mining.

JWU42

legendary

Activity: 1666

Merit: 1000

2.1 is best with 57xx, 58xx, 5970 cards.

PhatK came out to try and improve 2.4 performance with these higher performance 5xxx series cards.

My linux boxen with 5770, 5850, and 5970 run 4-5% higher with 2.1 versus 2.4

ffwd

newbie

Activity: 17

Merit: 0

with overclocked 5550 im getting ~64M h/s on both 2.4 and 2.1 with latest poclbm
the difference is very very minor (within 0.2 Mh/s).

Perhaps 2.1 more beneficial with HD 4k range cards, but i see no reason to use it with HD 5k-6k

iopq

hero member

Activity: 658

Merit: 500

for future reference it's here:
http://developer.amd.com/sdks/AMDAPPSDK/downloads/pages/AMDAPPSDKDownloadArchive.aspx

n4l3hp

full member

Activity: 173

Merit: 100

4000 and 5000 series = SDK 2.1 and poclbm

5000 and 6000 series = SDK 2.4 and phatk

CAT 10.4, 10.11, 11.4, 11.6 = less than 0.5MH difference in performance

joulesbeef

sr. member

Activity: 476

Merit: 250

moOo

Quote from: hchc on July 01, 2011, 11:25:13 AM

I just downgrade to 2.1 and went from 306 to 311 at 970/300 5830. Pretty happy about it.

poclbm? or phatk?

what cat driver? 10.4 or later

hchc

hero member

Activity: 504

Merit: 500

I just downgrade to 2.1 and went from 306 to 311 at 970/300 5830. Pretty happy about it.

CNMOH

member

Activity: 266

Merit: 10

I've never seen any performance difference when using 2.1 instead of 2.4.

rograz

hero member

Activity: 575

Merit: 500

I found away around the "no OpenCL device" problem by doing a full catalyst install first(including sdk 2.4) then running the uninstall manager and removing SDK 2.4, after that just install 2.1 without doing any reboots or anything and it's worked on all my rigs.

FreeJAC

member

Activity: 112

Merit: 10

Found my answer here, can't use GUI. http://forum.bitcoin.org/index.php?topic=22845.0

FreeJAC

member

Activity: 112

Merit: 10

I have tried a couple of times to downgrade this last time with a 5830 and both times I get no OpenCL device available. (not exact error)

I installed the latest 5830 driver, unchecking SDK 2.4 so that it doesn't install and then install 2.1.

Is the trick to use an older driver as well?

dinker

member

Activity: 103

Merit: 10

so 3-5% that's not too shabby!

iopq

hero member

Activity: 658

Merit: 500

found the older version, downgraded and my performance did go up 4-6 mhash/sec!

iopq

hero member

Activity: 658

Merit: 500

If I'm using a stock ATI 5750 with SDK 2.4 is it worth downgrading? I'm getting 132 Mhash/sec with m0mchil's miner, so I don't know if it's worth worrying about it or even if I get a better hashrate

also, where would I even get older versions?

Topic: Downgrade to SDK 2.1? (Read 3622 times)