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Spd timings on g.skill ddr500 ram different than advertised

T

taco1435

Member
Using CPU-Z I found that the SPD timings were 3-5-5-10 when the are supposed to be 3-4-4-8 for my ram http://www.gskill.com/f1-4000usu2-2gbhz.htm. Should I send my ram back or will it work the same if i manually change it to 3-4-4-8 timings(which ive alrdy done and it seems to be working fine).

Also, when i manually set the memory frequency to 250 MHz in bios it is only seen as 225 MHz in CPU-Z. does anyone know why this would happen?
 
opteron 165
biostar t-force 6100-939
using onboard graphics while i await my 7800 gt thats being RMAed
im using this 2 gig kit http://www.gskill.com/f1-4000usu2-2gbhz.htm
and i dont even know what a divider is so i guess not.

also, i plan to overclock my opteron 165 so i wanna know if this different SPD timing will affect ocing in anyway
 
ok well the main problem is when i set the normal memory frequency in bios(which is 250 MHz) CPU-Z sees it as 225 mhz. Why is this?
 
You're OCing right now aren't you?

Also, in your bios, does the RAM have options for 100/133/166/200/233/250? Is that where you're setting it to 250?


 
Originally posted by: n7
You're OCing right now aren't you?

Also, in your bios, does the RAM have options for 100/133/166/200/233/250? Is that where you're setting it to 250?
Click to expand...

Ya thats where i set it to 250. I'm not OCing right now but I plan to probably tomorrow. I just wanna make sure my RAM can run at the advertised speed
 
Hmm, you have the latest CPU-Z?

Try checking with Everest too.

Keep in mind that when you start OCing, you're going to have to drop the RAM from the 250 setting to the 233 or most likely the 200 one, since those settings over 200 mean the RAM is running faster than the HTT.
 
It's the latest version and i checked with everest and it says the same thing. Why would the frequency cpu-z reads be different from what i put in the bios?
 
I just realized that 225 (aka DDR450) is actually correct.

That's the correct speed for using the 250 divider.

9*200 = 1800 / 250 divider = 7.2 rounded up to 8 (next divider)

Therefore, at your speed (9*200 = 1800)

1800 / 8 = 225

Confused? :laugh: Yeah, me too, but that's how A64 dividers work.
 
Okay, after some rough guesswork, try this:

Since you don't want to OC the CPU yet, you just want to verify the RAM works at 250 (DDR500), set your CPU multiplier down to 8, & set the HTT (FSB) to 220, & the RAM, keep it at 250.

Unless i've miscalculated, this should set your CPU to 1.76 GHz, & your RAM to 251.4 aka DDR502 😛

Oh, & make sure you lower the HT Link/LDT to 4x or 800 before you raise the HTT (FSB).
 
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