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Author Topic: 12.1 release (not preview) CPU usage DOWN  (Read 1996 times)
chiropteran
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January 30, 2012, 04:12:23 PM
 #1

Not sure if this is well known or not, I've heard mixed things.

Windows 7 32 bit
Radeon HD 5830 875mhz GPU
3.4ghz Pentium 4 (ancient, I know)
1 GB RAM

Using

Diablominer
12.1 catalyst drivers

CPU usage while mining: 0-5%

255mhash

I previously had 11.6 drivers on this machine, and CPU was nearly always at 100% while mining.

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ssateneth
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January 30, 2012, 09:30:35 PM
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you're kind of late. cpu been gone for a long while now. https://bitcointalk.org/index.php?topic=61340.msg715916#msg715916

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January 31, 2012, 05:30:55 AM
 #3

you're kind of late. cpu been gone for a long while now. https://bitcointalk.org/index.php?topic=61340.msg715916#msg715916

A long while being three days ago?

Nothing wrong with using a P4, they were sound old chips back in the day. Sounds like 12.1 fixed the CPU usage problem, thanks for sharing. Maybe I'll finally update my drivers.

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January 31, 2012, 05:32:11 AM
 #4

Don't forget it will install SDK2.6 and completely screw up your hashrates.

Primary developer/maintainer for cgminer and ckpool/ckproxy.
Pooled mine at kano.is, solo mine at solo.ckpool.org
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January 31, 2012, 05:38:03 AM
 #5

Don't forget it will install SDK2.6 and completely screw up your hashrates.

According to this thread, the effect is pretty minimal, though you do have to clock your memory higher. Upgrading would probably make sense for a hybrid gaming/mining rig.

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ssateneth
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January 31, 2012, 07:31:02 AM
 #6

Don't forget it will install SDK2.6 and completely screw up your hashrates.

According to this thread, the effect is pretty minimal, though you do have to clock your memory higher. Upgrading would probably make sense for a hybrid gaming/mining rig.

for anyone that actually cares about their power bill, 2.6 is just 100% terrible. Hash rates are -significantly- lower than 2.1/2.4/2.5, and requires high memory frequency for barely acceptable mhash, and high memory = lots of power. i've seen reductions of about 30w per card reducing memory from stock to 330mhz and get even better mhash with the lower clock than high clock on 2.1/2.4/2.5. please dont encourage people to use 2.6 unless they have a 7970, then its unavoidable.

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January 31, 2012, 07:45:20 AM
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for anyone that actually cares about their power bill, 2.6 is just 100% terrible. Hash rates are -significantly- lower than 2.1/2.4/2.5, and requires high memory frequency for barely acceptable mhash, and high memory = lots of power. i've seen reductions of about 30w per card reducing memory from stock to 330mhz and get even better mhash with the lower clock than high clock on 2.1/2.4/2.5. please dont encourage people to use 2.6 unless they have a 7970, then its unavoidable.
[/quote]

I have read that many times as well but I didn't see much of a drop for 2 5970's.....830/300 at 386 MH/sec each core with 12.1 and 2.6 on Cgminer 2.1.2. However same config with the latest Cgminer 2.2.1 it goes down to 338 MH/sec not sure on the difference with no other changes.

At 386 MH/sec this rate seems to go right along with what most people are getting at that overclock. I tried sdk 2.5 with 12.1 and saw no difference.
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February 09, 2012, 12:18:31 AM
 #8

Does this improve MHash performance on my HD6950 GPU without the CPU usage bug? If so what kind of boost should I expect to see?Thanks.

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February 09, 2012, 02:05:30 AM
 #9

SDK 2.6 (included with 12.1) works best at the stock GPU memclock of 1000MHz; GPU memory underclocking is no longer required (nor available without a drop in hashrate) to get you lower video card power usage. However, if you are able to squash the CPU usage bug when no other drivers worked (100% of your CPU being used on at least one core, happens more often on multi-GPU mining), that might save you 25 watts or more depending on your system's CPU.

The most optimized mining settings using 11.12/12.1 are within 1% of previous drivers and SDKs's hashrate, as referenced on the thread mentioned above.

ssateneth
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February 09, 2012, 02:31:58 AM
 #10

SDK 2.6 (included with 12.1) works best at the stock GPU memclock of 1000MHz; GPU memory underclocking is no longer required (nor available without a drop in hashrate) to get you lower video card power usage. However, if you are able to squash the CPU usage bug when no other drivers worked (100% of your CPU being used on at least one core, happens more often on multi-GPU mining), that might save you 25 watts or more depending on your system's CPU.

The most optimized mining settings using 11.12/12.1 are within 1% of previous drivers and SDKs's hashrate, as referenced on the thread mentioned above.

It may be within 1% performance (see 1% slower), but it also requires using a lot more power than necessary because it requires more electricity to drive memory at 1ghz than 300mhz. 2.1 should still be used when possible, else 2.4/2.5. 2.6 is a last resort.

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