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Windows 7: RAM Performance

11 Jul 2011   #41
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Okay, but one would have to have XMP RAM to be able to use it automatically or manually...mine is not. I asked about that when deciding which RAM to buy, and was told to ignore it, because it only pertained to Intel.


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11 Jul 2011   #42
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Quote:
As far as I am aware,there is no way to change anything in the CPU. The only changes have to be done in bios. With mine, I had to first set the memory to manual, it then allowed me to set timings. I had to set the voltage the increase the FSB to get it to rated speed. Then I had to raise the CPU NB to stabilize the settings.
So doing that can only be done by guess and by gosh?
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11 Jul 2011   #43
essenbe

Windows 10 Pro/ Windows 10 Pro Insider
 
 

My ram did have XMP profiles. It is, for the most part an Intel thing. But, it can be set on AMD boards the way I explained. Wit Intel you can just enable XMP profiles, with AMD you have to set the values manually and increase the FSB. With AMD the memory controller is on the CPU and it will not set it any higher than 1333 9-9-9-24. The only advantage I am told, is that you can run the ram at a lower frequency but tighten up the timings. I am personally not convinced that the frequency makes a great deal of difference. Dave76 is the resident expert on memory and timings.
See if this will help. It is from the g skill forum about AMD boards and DDR3-1600 ram
RAM Performance-gskill.png


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11 Jul 2011   #44
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

I noticed that the author of that attachment, said that it doesn't really matter which brand of motherboard is involved...do you agree with that?
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11 Jul 2011   #45
essenbe

Windows 10 Pro/ Windows 10 Pro Insider
 
 

Quote   Quote: Originally Posted by seekermeister View Post
I noticed that the author of that attachment, said that it doesn't really matter which brand of motherboard is involved...do you agree with that?
Yes. The only real differences is that some have different options in bios than others, but they are all constrained by the CPU memory controller and all work basically the same.
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11 Jul 2011   #46
sygnus21

Windows 10 Pro
 
 

Quote   Quote: Originally Posted by seekermeister View Post
Okay, but one would have to have XMP RAM to be able to use it automatically or manually...mine is not. I asked about that when deciding which RAM to buy, and was told to ignore it, because it only pertained to Intel.
No true. XMP just tells the BIOS that it can run at it's listed spec automatically if the the BIOS can read the XMP profile. If not, just set the memory manually.

Example: I have Corsair's Dominator memory which does have an XMP profile to set the memory automatically at 1600MHz, 8-8-8-20 @ 1.65 volts. However my motherboard will automatically set the memory at 1066MHz @ 1.5 volts if I don't enable XMP in the BIOS (my MB allows this), or.... the motherboard didn't have an XMP option.

In this case I can either enable XMP in the BIOS, or manually set the memory to it's rated specs. For me, I set it manually, even though I could use the profile.

BTW if I wanted to overclock the RAM I would override the XMP profile and allow the RAM to be overclocked, whether manually or automatically.

Anyway whether the RAM/motherboard has XMP or not, you can still manually adjust the RAM - unless the motherboard itself doesn't allow for it.
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11 Jul 2011   #47
pparks1

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by seekermeister View Post
No I have a 890FX Deluxe 4, therefore it is an 890 chipset, not 990. You speak of OCing, but it's not OCing just to set the RAM to run the way that it supposed to.
The RAM is rated to run up to 1600Mhz. This doesn't mean that by default, when plugged in, that it's going to run at 1600Mhz. The default setting for a 1090T is 1333Mhz. If you wan to run faster than 1333, technically it's considered an overclock.

It seems pretty common that people tend to purchase "high performance" RAM, but don't realize that without adjustments, tweaks and testing...it simply isn't going to run at those speeds. And getting it to run at those speeds, can be troublesome as all of the changes required can cause system instability. Even in a situation where you don't have XMP support, setting your specs manually may require voltage tweeks and could cause additional north bridge stress resulting in system instability. (note: I'm not saying that you were NOT aware of this, it's just a blanket statement of generalities from many people that I deal with).


The advantages of having a 1090T RAM and DDR3 1600Mhz RAM is that you have additional headroom available if and when you decide to try to overclock. So, instead of being at 1333Mhz, you can raise up another 267Mhz before your RAM will be at full speed.

My general opinion is that you are better off with tighter timings and a lower clock speed, than looser timings and a higher clock speed. And from what I have seen on the forums, the performance difference between 1333Mhz and 1600Mhz is often around the 2% mark. So, if doing a 3 hour encode, that's approximately a 216 second savings or 3.5 minutes. Over the course of 3 hours, that may not be enough time savings to justify the investment of time and effort to get there. But that's up the individual user to decide.

I just had this very same discussion with a coworker this past week regarding his new build. He went with a Core i5-2500K, and opted for G.Skill DDR3 2133Mhz RAM. I suggested going with 1600Mhz and tighter timings. I think his 2133 RAM is 11-11-11-30. His parts have mostly arrived, so I should know before too long how well this 2133Mhz RAM is going to run at 2133Mhz speeds on his board.
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11 Jul 2011   #48
sygnus21

Windows 10 Pro
 
 

With today's systems 1600MHz is nothing and hurts nothing. I can enable my XMP settings and it won't overclock my CPU when the RAM is running at 1600MHz. And yes, by definition, 1600MHz is considered overclocked by JDEC specifications.

Anyway I will agree that there will be voltage adjustments - it has to be since the higher speed requires a bump in RAM voltage, which to RAM is designed to take. However I've also found that enabling XMP on my MB also slightly increases other voltages - CPU Vcore and QPI/Vtt voltages (1366 chipsets with an i7-900 CPU).

This is why I, and most other users, use manual settings since this allows us to just set the RAM speed, timings, and Voltage only, without tweaking/overclocking other items/settings, including the CPU.

Again this is in reference to an Intel 1366 chipset system. I can't or won't say the same is true for AMD.

My point is the above statement isn't always true, though he does have some points.
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11 Jul 2011   #49
essenbe

Windows 10 Pro/ Windows 10 Pro Insider
 
 

He does have some points. But, with my 1155 board, I enabled XMP profile, set to auto to set timings according to spd, and set speed at the rated 1866. No voltage increase requirev. Dram voltage is 1.5.
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11 Jul 2011   #50
sygnus21

Windows 10 Pro
 
 

Quote   Quote: Originally Posted by essenbe View Post
He does have some points. But, with my 1155 board, I enabled XMP profile, set to auto to set timings according to spd, and set speed at the rated 1866. No voltage increase requirev. Dram voltage is 1.5.
You have an 1155 chipset, I have a 1366 chipset - they have different memory requirements. Also the memory may have different voltage requirements as well.

Again, there is no cut and dry case. All have valid points, which I acknowledge.

And the purpose of the XMP profile is to set the memory to it's designed settings automatically - speed, timings, voltage. There's no need to set anything, other then enabling XMP in the BIOS.

If the BIOS doesn't support XMP, you can't use the profile built into the memory, and thus would have to set the memory specs manually.

How To Enable XMP Performance Profiles « Corsair® Blog
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