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Another P55 round-up: Asus/Asus/DFI
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Old 28th December 2009, 10:47   #71
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Findings are in line with THG - good enough, I won't rant in the article
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Old 28th December 2009, 11:02   #72
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TURBO DISABLED



TURBO ENABLED



Only 4k is a problem with speedtech enabled.
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Old 28th December 2009, 11:08   #73
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so now only C-state disabled in BIOS?
does in impact power usage at idle, do you have a power meter,
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Old 28th December 2009, 11:12   #74
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Only have a broken one .
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Old 9th January 2010, 14:34   #75
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Coming back to the HDD issue, this is what THG said:

Quote:
In short: really fast SSDs that can deliver 200 MB/s or even more of throughput become limited by CPU performance due to power saving mechanisms—or more precisely, they are bottlenecked by a limited availability of CPU time.
Assuming that this hypothesis is correct, we should see this kind of behavior when manually decreasing the CPU multiplier. Assuming that the PCMark HDD test results are accurate, we can see that:

- 3.80GHz = 84000
- 2.67GHz = 80000

The result when enabling the power-saving settings, the result is around 52000. In theory, these power-saving settings decrease the CPU multiplier to the lowest possible value, in this case "12x133" = 1600MHz.

So, there are two possibilities:

1) The hypothesis is correct and the HDD transfer rate is affected mostly because of the reduces amount of CPU cycles.
2) The hypothesis is incorrect and the HDD transfer rate is affected by another cause, possibly in interaction with the reduced CPU cycles.

There's an easy test to test the hypothesis: if the reduced CPU cycles are indeed the cause of the sudden drop in HDD performance, we should see the same behavior when manually decreasing the CPU multiplier while disabling all power saving features. If the hypothesis is correct, we should find a logarithmic relation between HDD tranfer rate and CPU cycle: the lower the clock frequency, the faster decrease in HDD performance. If we find a different relation, eg linear, we'll see that the performance result when enabling power-saving technology differs from the performance result obtained when manually decreasing the CPU multiplier.

Sadly enough, I don't have the tools to measure the performance right now as the Acard is at a colleagues place.
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Old 9th January 2010, 15:09   #76
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the C-states disable features on the CPU to reduce power usage at idle, it's not completely identical to manually lower the multiplier, that is just speedstep in action
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Old 9th January 2010, 15:21   #77
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Hm.

I assume that we can trick the CPU not to go to the C-states by putting a bit of load on the cpu's using an application that load all four cores.
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Old 9th January 2010, 22:47   #78
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Intel TAT can put a 10% workload on all cores easily
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Old 9th January 2010, 23:44   #79
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Ok.

Is there a tool that reports in what power saving state a CPU is in?
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Old 10th January 2010, 08:33   #80
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is this any good? http://intel-r-processor-id-utility..../3.9/download/

More info on power managment:
- http://www.intel.com/technology/itj/...management.htm
- http://www.hardwaresecrets.com/article/611 (C States)
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