Windows 7: Ram comparison With and Without X.M.P!

Before Without X.M.P

After With X.M.P


not much of a difference but not bad considering it took 30 seconds to change in the bios, and its safe! :)

Interesting results but "Before" is the one with X.M.P, please? (if i follow order of the main tiltle " With & Without")

Edited, sorry should have made that more clear!

Interesting exercise, I never would have though using XMP vs. manual settings would make a difference.

If you're up to it, it would be of interest to try the same thing using a cmd window and entering

with and without XMP. Set the RAM as per the label for "without".

Will give it a go first thing tomorrow! :)

with "winsat mem",

Got a result of memory performance: 22687.30 MB/s in 06.68 total runtime set to Manual...

will try later with Dram set to X.M.P.


EDIT:
With default X.M.P in bios: 21386.84 MB/s memory performance in 06.26 total runtime.

Which can be explained as when on X.M.P it is set "Optimized" but when on Manual i do set on "Extreme" working with my Dram phases.

Otherwise, X.M.P when set to "Extreme" gave me: 22684.32 MB/s for a total runtime 06.19

tried the trial version but a bit cut-off....

Manual: 19997 Mb/s
XMP: 20565 Mb/s

I think for a fair comparison the XMP profile should not be Extreme and on manual it should be the timing/frequency/volts as on the RAM label.
CPU speed will also have some effect, use the same for each run.

Sorry for late answer.

When i did run the benchmark or winsat mem i did use manual settings the timing/frequency/volts as on the RAM label, but "DRAM Power Phase Control" was not set to auto but Extreme in the Bios.

When did it with XMP one was default setting and "DRAM Power Phase Control" to Optimized and the second one was Extreme with the timing/frequency/volts as on the RAM label.

So i did get first two results, then another one.

1a)
Manual: timing/frequency/volts as on the RAM label & "DRAM Power Phase Control" to Extreme => 22687.30 MB/s memory performance

1b)
XMP: timing/frequency/volts as on the RAM label & "DRAM Power Phase Control" to Extreme => 22684.32 MB/s memory performance

2a)
XMP: As per Bios default setting, "DRAM Power Phase Control" to Optimized => 21386.84 MB/s memory performance

2b) Yes, is missing result in Manual setting: timing/frequency/volts as on the RAM label & "DRAM Power Phase Control" to default.

We have to remember the purpose of XMP - to automatically bump "performance" memory up to it's rated specs. Remember the "official" specifications of RAM was/is up to 1066MHz, and anything above that is still considered "overclocked" (I don't agree but...), therefore when a motherboard BIOS detects RAM it basically sets it to the "old" predefined specs, say 1066MHz, 1.5 volts. However say you have some performance RAM such as Corsair's GT RAM (CMT12GX3M3A2000C9) modules that are spec'd at 2000MHz, 1.65volts, well the MB, using the old spec's will set these at 1066MHz, 1.5 volts; thus your RAM would be "under performing" and you would either have to use XMP to bump them to rated specs, or manually set them to their rated specs. Thus the purpose of XMP is to ensure these high performance RAM modules run at peak performance.

Here's where it can get tricky... some feel that while XMP works, it can also raise other system voltages as well; I know I had to manipulate my voltage setting on my Gigabyte X58 MB when using XMP if I wanted to overclock past 3.8GHz. From that point on, I got into the habit of manually setting my RAM spec instead of using XMP. With my new system (Haswell), I just let XMP do it's thing with my Corsair RAM (1866MHz, 9-10-9-27-2T, @ 1.5volts) as I'm currently not overclocking.

What has this to do with the post/thread... I don't know, info I suppose

BYW I could run my memory benchmark (AIDA 64 Extreme) a few times and get scores all over the place without changing anything so keep that in mind.

My two cents.