Multiplicateur de mémoire système (SPD)

Question

Hello everyone,

As the title indicates, I'm looking for my SPD.
I currently have a Q6600 G0 overclocked to 3.0GHz and I'm not sure which SPD to set...
Unfortunately, explanations vary from one forum to another

My question is: What calculation should I use to find it?

P.S.: My FSB is at 333 and my RAM is 1066

Best regards

Configuration: Gigabyte GA-EP45-UD3
Intel Core(TM) 2 Quad Q6600 3GHz OC
OCZ DDR2 4x1Go PC8500 Reaper Edition
Gainward Radeon(TM) HD 4870 512Mo Golden Sample Edition 790/1050 OC
Corsair HX - 620W
Samsung Spinpoint F3 S-ATA - 1 To - 32 Mo
Windows 7 pro 64b / Firefox 9.0

marcmarais · Accepted Answer

Hello,
I think there is confusion between several terms
the SPD of a memory module is the Serial Presence Detect, which simplifies information about the module to the system (frequency, CAS, VRam...), see:
https://en.wikipedia.org/wiki/Serial_presence_detect
you are looking for the correct coefficient for your RAM: it is usually automatically set by the system, but it can be modified in case of overclocking

To find out how your RAM is set, you just need to use CPU-Z
please provide the 'memory' and 'SPD' tabs by taking a screenshot

Johniop · Answer

Hi there, yes I'm just starting with OC as you may have noticed

here is the link to see my SPD and memory on GPU-Z

https://docs.google.com/document/d/1u_TAlf8Lc7BqxuOkDLkBrBiyicw1o_Nr1Ic5oK0_UmI/edit

marcmarais · Answer

hi,
your RAM is OCZ DDR2 PC2 5300 at 667MHz, it is set to 1066MHz, according to the Memory tab
as indicated in the last column of the SPD, you need to set the VRAM voltage in the BIOS to 2.10V for it to be stable

Johniop · Answer

Re!

Yes, actually I don't have a stability problem, but I'm looking for the necessary calculation to determine what MHz I should set my SPD (3.2B 2.1A...etc) to achieve optimal performance.

Because my SPD got messed up without me paying attention during various overclocking manipulations, I was at 800MHz stable with OCCT, then I set it back to 1066MHz, which was also stable.

So I don’t know what value to use because I have the impression that my loading times in-game (SWTOR) and the responsiveness of the PC seemed to perform better at 800MHz.

Currently, I am at 1066MHz.

marcmarais · Answer

The SPD cannot be adjusted or misadjusted; I explained to you that it is the information from the memory module...
For your information, the SPD is contained in a small chip implanted on the stick, circled in red in the photo:
https://en.wikipedia.org/wiki/File:SPD_SDRAM.jpg
However, what you can adjust is the RAM frequency, and it is very simply set in the BIOS by choosing its value from the available options once you have selected your FSB (333 MHz in your case).

To indicate the optimal value, I'm having a bit of trouble because there is an issue with the information provided by CPU-Z:
Your OCZ RAM, which is advertised as DDR2 1066 MHz according to its reference (OCZ2RPR10661G), is recognized by CPU-Z as DDR2 667 MHz (PC2 5300).
However, DDR2 667 sticks cannot, under any circumstances, be overclocked to 1066, even by significantly increasing their VRAM voltage.
So I think these are more likely 800 MHz sticks, overclockable to 1066, which is very common with DDR2, and in that case, the value of 800 MHz seems to me to be the most appropriate for your sticks ;)

Johniop · Answer

Okkk :) yes, it was a misunderstanding on my part, sorry
in any case now I understand :)

And for my RAM frequency, do you have any idea where that could come from?
maybe it's because my VRAM is set to auto

But I think I'll set it back to 800MHz because performance-wise it seems better to me

Otherwise, I haven't touched the timings or anything related to the RAM

You seem knowledgeable, so if you have any good overclocking tutorials to share, I'm interested :)
Thanks a lot for the info anyway :)

Best regards

marcmarais · Answer

Well no, I don't really know what happened, but I think your RAM sticks are 800MHz at base, for the reasons I mentioned

To overclock your Q6600, 3GHz is already a good value
You can push higher, say 3.4GHz, by following what I've written here
overclocking-des-cartes-meres-cpu-intel-775-et-1156
I'm talking about the Q6600, and the issues I encountered with my Asus P5KC motherboard
You also have the Overclex article (mentioned at the beginning of my article) which provides the settings values to achieve 3.4GHz with the Q6600

Johniop · Answer

Cool! :) Thank you very much for such a quick response!  Thanks again :)

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