Timings for 1600mHz ram running at 1333mhz

[neaor]

Hi,

I have this ram: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231445

It is rated at 8-8-8-24 at 1600mHz, but I want to run it at 1333mHz because I don't want to enable XMP on my machine (disables turbo). What timings should I run this at? If I look at CPU-Z, it shows timings:
XMP-1600: 8-8-8-24, tRC 34, Command Rate 2T
JEDEC #4 (685mHz, the closest to the speed I want to run it at): 9-9-9-24, tRC 33, blank Command Rate
I thought ram rated for higher speeds but run at a lower frequency (1600mHz ram running at 1333mHz) is supposed to decrease the timing, not increase it?

 

[palladin9479]

You should be able to see the DDR3-1333 settings inside CPU-Z. Otherwise inside your BIOS just set it to DDR3-1333, your BIOS will query the SPD and get the required settings auto magically.

 

[neaor]

that's the problem, i did let it and it set it to: JEDEC #4 (685mHz, the closest to the speed I want to run it at): 9-9-9-24, tRC 33, blank Command Rate.

my question was, if it's rated at 8-8-8-24 for 1600mHz, shouldn't it have better than 9-9-9-24 when running at 1333mHz?

 

[palladin9479]

That depends on the memory manufacturer. They could of just left the loose timings as a failsafe. You might try tightening them up but I wouldn't suggest it.

 

[neaor]

so it's not true that memory should have faster timings at 1333mHz than its timings at 1600mHz?

 

[palladin9479]

Depends on how the manufacturer set it.

All your seeing in the SPD are the default factory settings, they can be aggressive or conservative.

Your free to change them if you want.