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Changing RAS ACT, RAS to RAS Delay, and Ref Cycle timings.

post #1 of 5
Thread Starter 
I want to change or modifty these for better performance but I've read that reducing them too low would cause data corruption.

Is this true? Is prime95 blend test good enough to tell me if such a problem is occurring?
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post #2 of 5
Well, typically that data corruption occurs if you boot into the OS with unstable memory settings. If you havent already, use memtest 86. This is what I use

http://www.memtest.org/download/4.20/memtest86+-4.20.usb.installer.zip

That is just what you need to throw it onto a usb and boot straight into memtest before entering windows. If you see any red errors pop up on your screen, then youre unstable. Restart into bios, and change settings from there. To make me feel comfortable, I would say an absolute minimum of 5 passes. If youre on 4gb, then its pretty fast, 8gb, kind of fast....16gb, youll be there a while;)

The first 4 settings play the biggest role and are the easiest to mess with, these being CL, tRCD, tRP, tRAS, and finally, command rate. What are your ram's stock speeds, stock timings, and are you attempting to change these speeds via the divider or through the bus speed?
post #3 of 5
Thread Starter 
Quote:
Originally Posted by guitarmageddon88 View Post

Well, typically that data corruption occurs if you boot into the OS with unstable memory settings. If you havent already, use memtest 86. This is what I use
http://www.memtest.org/download/4.20/memtest86+-4.20.usb.installer.zip
That is just what you need to throw it onto a usb and boot straight into memtest before entering windows. If you see any red errors pop up on your screen, then youre unstable. Restart into bios, and change settings from there. To make me feel comfortable, I would say an absolute minimum of 5 passes. If youre on 4gb, then its pretty fast, 8gb, kind of fast....16gb, youll be there a while;)
The first 4 settings play the biggest role and are the easiest to mess with, these being CL, tRCD, tRP, tRAS, and finally, command rate. What are your ram's stock speeds, stock timings, and are you attempting to change these speeds via the divider or through the bus speed?

Thanks. It's an i3 540 @ 4.6 GHz (200 x 23) so my ratios are 6, 8 and 10. I've tried memories rated at 2000 MHz but the board doesn't like it so I'm sticking with a pair of mushkin 1600 MHz kit with 6-8-6-24 Timings.

The XMP didn't work so I set the timings manualy but that didn't work either. I started lowering them one at a time and rebooting. Right now It's running perfectly stable @ 6-8-5-19 with 1.65 memory voltage and CPU running at 200 x 23. by stable I mean 3 hours prime95 blend stable so far with 95% memory usage.

I'm gussing if it's stable with prime for that long, I wouldn't need to bother with memtest right?
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post #4 of 5
No, you should always begin with at least 2 passes of memtest Id say, but like I said i get the warm fuzzy at 5 or more passes just to be sure. Because the more you have messed up boots into your OS due to faulty memory, the higher you run the risk of corrupting files, and that's even more of a pain to root out that gremlin. Thats when you get corrupted boot files and such, its a total pain in the butt.

If not, just run it all night to be COMPLETELY sure your memory isn't the cause of an instability. Because you can test with prime all you want, but it can be very tricky to decipher errors in prime, vs. an error you discover while using memtest since its such a targeted test. Sometimes too, you can be limited to what you can do with your ram based on the height of your cpu overclock. Im not sure how those i3's work, but are you able to overclock the memory controller by istelf? I came to sandy bridge from amd- amd I could o.c. my northbridge, and sandy bridge the IMC is on the chip and I cant overclock so let me know how it is for you.
post #5 of 5
Thread Starter 
Alright, I'll run memtest overnight and see if anything happens. Memory overclocking is really easy and simple with 1156 and pretty much all intel platforms really.

You got the Memory voltage and ICH/VTT that you mess with and the standard memory timings.
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9 * Corsair SP120 Quiet Edition @ 7V 8.1 Pro 12-bit Asus VG27HE 27" 1080p @ 145Hz Corsair Vengeance K60 
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CPUMotherboardGraphicsRAM
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