memory for budget machine - Page 5

wildrabbitt · 2015-08-05, 04:14

Thanks. I'll look into the FFT maths and benchmark thing soon.

BTW, I'm running an FX9370 4.4GHz with 8-cores. Since this thread started I switched to running 4 test instead of 8 and

the ms/iter have halved from about 200 to 100.

I've only got 4GB 1333MHz memory in it.

Anyone got any advice?

VBCurtis · 2015-08-05, 06:05

The advice was given earlier in this thread- for the parts of the CPU LL tests use, that chip is only a 4-core, so you shouldn't bother running 8 tests on it.

The iterations run so slowly on AMD that memory bandwidth isn't an issue. You can see this by comparing iterations times with 3 tests running vs 4 running; I reckon they'll be within 2-4%. An i3-4xxx would take 20ms/iteration (or 30? I forget), rather than 100; so there is 5x (or 3.3x?) more data flowing to/from memory per second on an i3 thread vs your FX. That's why AMD isn't memory-limited; the CPU is so slow the memory can keep up.

wildrabbitt · 2015-08-05, 06:38

So 100 ms is to be expected?

The only problem is the machine is shutting down now. As far as I can tell it's overheating. It wasn't with 8 tests.

Should I try it with 3 tests or get some more memory?

VBCurtis · 2015-08-05, 07:35

Quote:

Originally Posted by wildrabbitt

So 100 ms is to be expected?

The only problem is the machine is shutting down now. As far as I can tell it's overheating. It wasn't with 8 tests.

Should I try it with 3 tests or get some more memory?

Have you looked at the benchmark page yet? And, given what I told you in the previous post, why would more memory help with speed, let alone help with overheating?
Huh?

wildrabbitt · 2015-08-06, 01:11

Quote:

Have you looked at the benchmark page yet? And, given what I told you in the previous post, why would more memory help with speed, let alone help with overheating?
Huh?

I didn't ask if would help with speed. I thought it might help with overheating because I thought if the memory sticks are what's overheating then having one more would lessen the work they have to do and cool them. Daft I expect.

Still I need to know what to do to stop the machine from turning off.

fivemack · 2015-08-06, 05:51

To stop the machine from turning off, you need to cool it better. What is your current cooling solution?

wildrabbitt · 2015-08-06, 12:08

Got a Noctua NH-D14 fan on it.

https://www.google.co.uk/search?q=No...vUuIpuKbC9A%3D

That's it though.

Perhaps I need some more fans?

kladner · 2015-08-06, 14:02

What do you have for case ventilation?

chris2be8 · 2015-08-06, 15:27

First check what temperature it is running at now. Try sensors or acpi at the command line if you havn't got a GUI app to show them. Also check the logs for temperature related messages (and messages just before it shut itself down).

On my system with an AMD CPU acpi shows:

Code:

chris@linux-d853:~/ggnfs/trunk/tests> acpi -Bt
     Thermal 1: ok, 71.0 degrees C

If the temperatures look reasonable and there are no interesting log messages before a shutdown suspect the PSU. I've had several PSUs fail with symptoms of the system crashing at progressively shorter intervals until it would not boot up at all. Replacing the PSU with a better model (Corsair) fixed the issue for good.

Chris

wildrabbitt · 2015-08-06, 18:59

Quote:

What do you have for case ventilation?

No other fans in the case.

VictordeHolland · 2015-08-07, 13:58

Quote:

Originally Posted by wildrabbitt

No other fans in the case.

Is it an open case/caseless PC? Otherwise I would stongly advice to add a few casefans to help move the heat from the interior to the outside.

2015-08-05, 06:05	#46
VBCurtis "Curtis" Feb 2005 Riverside, CA 15F9₁₆ Posts	The advice was given earlier in this thread- for the parts of the CPU LL tests use, that chip is only a 4-core, so you shouldn't bother running 8 tests on it. The iterations run so slowly on AMD that memory bandwidth isn't an issue. You can see this by comparing iterations times with 3 tests running vs 4 running; I reckon they'll be within 2-4%. An i3-4xxx would take 20ms/iteration (or 30? I forget), rather than 100; so there is 5x (or 3.3x?) more data flowing to/from memory per second on an i3 thread vs your FX. That's why AMD isn't memory-limited; the CPU is so slow the memory can keep up. Last fiddled with by VBCurtis on 2015-08-05 at 06:09 Reason: or is it 30ms?

2015-08-06, 15:27	#53
chris2be8 Sep 2009 5²×97 Posts	First check what temperature it is running at now. Try sensors or acpi at the command line if you havn't got a GUI app to show them. Also check the logs for temperature related messages (and messages just before it shut itself down). On my system with an AMD CPU acpi shows: Code: chris@linux-d853:~/ggnfs/trunk/tests> acpi -Bt Thermal 1: ok, 71.0 degrees C If the temperatures look reasonable and there are no interesting log messages before a shutdown suspect the PSU. I've had several PSUs fail with symptoms of the system crashing at progressively shorter intervals until it would not boot up at all. Replacing the PSU with a better model (Corsair) fixed the issue for good. Chris

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2015-08-05, 04:14	#45
wildrabbitt Jul 2014 2×3²×5² Posts	Thanks. I'll look into the FFT maths and benchmark thing soon. BTW, I'm running an FX9370 4.4GHz with 8-cores. Since this thread started I switched to running 4 test instead of 8 and the ms/iter have halved from about 200 to 100. I've only got 4GB 1333MHz memory in it. Anyone got any advice?

2015-08-05, 06:38	#47
wildrabbitt Jul 2014 2×3²×5² Posts	So 100 ms is to be expected? The only problem is the machine is shutting down now. As far as I can tell it's overheating. It wasn't with 8 tests. Should I try it with 3 tests or get some more memory?

2015-08-06, 05:51	#50
fivemack (loop (#_fork)) Feb 2006 Cambridge, England 1100100110110₂ Posts	To stop the machine from turning off, you need to cool it better. What is your current cooling solution?

2015-08-06, 12:08	#51
wildrabbitt Jul 2014 2·3²·5² Posts	Got a Noctua NH-D14 fan on it. https://www.google.co.uk/search?q=No...vUuIpuKbC9A%3D That's it though. Perhaps I need some more fans?

2015-08-06, 14:02	#52
kladner "Kieren" Jul 2011 In My Own Galaxy! 2·3·1,693 Posts	What do you have for case ventilation?