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Asus P5ND2-SLI + Corsair CM2X512-8000UL = which latencies?


bhum

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hi,

 

corsair tells on their hp that the Latency for those modules are 5-4-4-9 (i think for 1000mhz). But if i run the modules at 800mhz what are the best latencies?

or can someone give me a short explanation about the latency-settings in the bios so i know what to change if i want to test myself :)

 

thanks!!

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thx for the link but there are to much background infos in a foreign language to understand :/

 

...if they can't set complete and good SPD informations they should have good informations about those things :(

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  • Corsair Employees
We publish the tested settings for a given module or modules, if you want to run them above or below the tested settings that is your prerogative, but you would need to establish the proper configuration for the way your system is configured, in other words just try the tested settings and then experiment from there with http://www.memtest.org.
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yeah thats right but if you dont know what a settings does you dont know what to change if the system is (un)stable).

 

btw. read http://www.corsair.com/corsair/products/specs/TWIN2X1024-8000UL.pdf and http://www.corsair.com/corsair/products/specs/CM2X512-8000UL.pdf. With the first pdf corsair tells us the SPD is programmed to 5-4-4-9 (no MHz) and the dimm is tested on 5-4-4-9 with 2.2V (no MHz) and the dimms are tested in pairs at 1000mhz (no latency-settings)

With the second pdf corsair tells us the SPD is programmed to DDR2-800 with 5-5-5-15 settings and the dimm is tested on 5-4-4-9 with 2.2V (no MHz) and the dimm is tested at 1000mhz (no latency-settings).

 

lets read out the SPD:

Module Size: 512 MBytes

Correction: None

Max. Bandwidth: PC6400 (400 MHz)

Manufacturer: Corsair

Part Number: CM2X512-8000UL

SPD Timings Table - 270 MHz: 4.0-4-4-13

SPD Timings Table - 400 MHz: 5.0-5-5-18

 

1. the SPD is NOT programmed to 5-5-5-15 on 800 MHz

2. the SPD is NOT programmed to 5-4-4-9 at any MHz

3. they're not PC8000, they're PC6400 (did you just overclocked 6400er and selled them as 8000er? Hey cool, you act like Microsoft)

4. we all know that the SPD settings are crap. ok, you need default settings (5-5-5-18) so they run in "every" board but why you can't set performance settings too?

 

Why do you set SPD Settings if you tell your customers "test it yourself". Just save your spare time and dont write any spd informations, doesn't matter if you write "Corsair ... provides outstanding support and service" (see http://www.corsairmemory.com/corsair/products/tech/memory_basics/153707/index.html page 34).

 

additionally corsair did not list my product in the memory guide (http://www.corsairmemory.com/corsair/configurator_search.html). You can't select the TWIN2X1024-8000UL or CM2X512-8000UL in the "Filter by Speed" and/or "Select a Module" DropDown-Lists.

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Please follow the link in my signature for the the tested settings, and in that post we explain the way we test our modules along with the make and model of MB we use to test them and the tested setting used for that specific module.

To be clear that link in my signature will take you to: XMS Qualification and Testing

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3. they're not PC8000, they're PC6400 (did you just overclocked 6400er and selled them as 8000er?)

That's exactly how speeds are done from memory and CPU manufacters. The higher clocked stuff is lower stuff that passes stringent tests and then are guaranteed at those speeds. Nothing new there, it's been done since the days of the 1 Mhz CPUs.

 

 

Why do you set SPD Settings if you tell your customers "test it yourself".
Some motherboards require SPD settings, otherwise they won't run (why I have no idea). Some also don't allow users to change their timings and strictly go by the SPD timing. It's also there for users who don't know how / don't want to change timings.

 

It's just good testing procedure to manually set them, at the least when testing, for if your system has a problem where it isn't reading them correctly, setting them manually may give someone a good enough solution. Can't speak for anyone other than myself, but I'd rather set the timings manually and ignore a stupid board problem like that than to waste my time getting the board RMA'd.

 

 

additionally corsair did not list my product in the memory guide (http://www.corsairmemory.com/corsair/configurator_search.html). You can't select the TWIN2X1024-8000UL or CM2X512-8000UL in the "Filter by Speed" and/or "Select a Module" DropDown-Lists.
DDR2-1000 (XM2S-8000UL) is there, albeit nothing's under it. I've contacted the appropriate people to fix that. Once that is fixed it should automatically appear under the appropriate motherboard searches. Here's a link to your motherboard:

 

http://compatible.corsairmemory.com/mini/search_redir.aspx?type=mb&mfgid=75&modelid=1254

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