<p>I still get 100% cpu when with Catalyst 11.9 when I use the -f1 flag on poclbm. I fixed it by bumping up to -f4, which gives me a slightly higher hash rate than the -f6 I had to use previously to fix cpu usage. </p>

CC BY-SA 3.0
2011-10-06T00:27:59.480Z
A better solution would be to downgrade drivers and not lose hashrate by toying with -f and -aggression settings
David Perry
CC BY-SA 3.0
2011-09-30T10:19:29.290Z
2011-09-30T10:19:29.290Z
Mocky
<p>Catalyst 11.9 resolved the issue for those mining on single GPUs but not multiple GPUs (including single cards which contain multiple GPUs like the 6990 and 5970). You can try setting the <code>-f</code> flag to higher numbers until CPU usage is reduced or try setting <code>-aggression</code> to 10 or lower. Note that these settings might reduce your hashrate significantly depending on how aggressively you change them from defaults.</p>

<p>The bug in question was introduced in Catalyst version 11.5 and at the time affected only multi-GPU setups. It remained in place for version 11.6 and in 11.7 actually began affecting single-GPU systems as well. In 11.9 the single-GPU bug was fixed, but the multi-GPU bug is still in place. There is a beta release of 11.10 available but I've not heard anything about whether it fixes the 100% bug or not.</p>

<p>A quick search shows that the 11.4 drivers are still available for <a href="http://www.filehippo.com/download_ati_catalyst_vista/9747/" rel="nofollow">32</a> and <a href="http://downloads.guru3d.com/AMD-Catalyst-11.4-Win-7-Vista-x64-download-2711.html" rel="nofollow">64</a> bit systems. Assuming you don't need anything that the newer drivers offer for non-mining purposes, 11.4 is probably your best bet. If you're running dedicated rigs it's <em>definitely</em> your best bet.</p>

<p><strong>Edit:</strong> <em>It appears that 11.10 did not fix the multi-GPU bug so 11.4 is still your best bet.</em></p>

CC BY-SA 3.0
2011-10-06T19:41:10.013Z
11.10 does not solve multi GPU 100% bug.  It may not be fixed in time for 11.11 either.

Miners should express to AMD their desire to see this bug finally fixed.

http://forums.amd.com/devforum/messageview.cfm?catid=390&threadid=153211
DeathAndTaxes
CC BY-SA 3.0
2011-10-06T20:26:09.817Z
Thanks for the info, I'll add it to my answer for completeness
David Perry
CC BY-SA 3.0
2011-10-06T00:27:11.150Z
2011-10-06T20:27:02.653Z
2011-10-06T20:27:02.653Z
David Perry
<p>Miners, did the new Catalyst version 11.9 fix 100% CPU usage issue for you? what's the best version of Catalyst to use for mining?</p>

CC BY-SA 3.0
2011-09-30T01:46:22.067Z
For one of my computers, yes - it also fixed my inability to watch youtube videos while mining on one computer but not the other.
Alex Waters
<cpu-mining><miner-configuration>
Miners, did Catalyst version 11.9 fix CPU usage issue for you?
KoKo
# Miners, did Catalyst version 11.9 fix CPU usage issue for you?

(Asked by: username_0 on 2011-09-30)

Miners, did the new Catalyst version 11.9 fix 100% CPU usage issue for you? what's the best version of Catalyst to use for mining?

**Tags:** cpu-mining, miner-configuration

> **Comments:**
> **username_1**: For one of my computers, yes - it also fixed my inability to watch youtube videos while mining on one computer but not the other.  

---

## 2 answers

### Answer by username_3 on 2011-10-06. Score: 4 | Accepted answer

Catalyst 11.9 resolved the issue for those mining on single GPUs but not multiple GPUs (including single cards which contain multiple GPUs like the 6990 and 5970). You can try setting the `-f` flag to higher numbers until CPU usage is reduced or try setting `-aggression` to 10 or lower. Note that these settings might reduce your hashrate significantly depending on how aggressively you change them from defaults.

The bug in question was introduced in Catalyst version 11.5 and at the time affected only multi-GPU setups. It remained in place for version 11.6 and in 11.7 actually began affecting single-GPU systems as well. In 11.9 the single-GPU bug was fixed, but the multi-GPU bug is still in place. There is a beta release of 11.10 available but I've not heard anything about whether it fixes the 100% bug or not.

A quick search shows that the 11.4 drivers are still available for [32](http://www.filehippo.com/download_ati_catalyst_vista/9747/) and [64](http://downloads.guru3d.com/AMD-Catalyst-11.4-Win-7-Vista-x64-download-2711.html) bit systems. Assuming you don't need anything that the newer drivers offer for non-mining purposes, 11.4 is probably your best bet. If you're running dedicated rigs it's *definitely* your best bet.

**Edit:** *It appears that 11.10 did not fix the multi-GPU bug so 11.4 is still your best bet.*

> **Comments:**
> **username_4**: 11.10 does not solve multi GPU 100% bug.  It may not be fixed in time for 11.11 either.  Miners should express to AMD their desire to see this bug finally fixed.  http://forums.amd.com/devforum/messageview.cfm?catid=390&threadid=153211  
> **username_3**: Thanks for the info, I'll add it to my answer for completeness  

---

### Answer by username_2 on 2011-09-30. Score: 0

I still get 100% cpu when with Catalyst 11.9 when I use the -f1 flag on poclbm. I fixed it by bumping up to -f4, which gives me a slightly higher hash rate than the -f6 I had to use previously to fix cpu usage.

> **Comments:**
> **username_3**: A better solution would be to downgrade drivers and not lose hashrate by toying with -f and -aggression settings  

---

