PC3700 Mem but what FSB?

Warpy · Jul 31, 2003, 09:53 AM

Hi

I just got myself some PC3700 and clocked the FSB to 210, here are my questions!

1. Should I adjust my CPU multi from 9 to anything higher?
2. Should I adjust my CPu voltage from Auto?

How can i get better performance?

Cheers in advance guys.

Kgentatszu] · Jul 31, 2003, 09:58 AM

Benchies! we want Benchies!~LOL.......how's your score?? anyway, i dunno 'bout the first but 'bout the second you should adjust them manually and set them as low as possible.....

daddy_fizz · Aug 2, 2003, 01:26 AM

pc3700 memory is made to be run at FSB 233, but to get it that high you might have to lower your multiplier, i don't know too much about amd processors any more, i just stick with my intel...

Kgentatszu] · Aug 3, 2003, 01:17 AM

so, what's your scores now?? did you manage to crack 18k???

Warpy · Aug 3, 2003, 08:25 AM

Hey Maxxypoos

I cant seem to benchmark my rig.. it keeps crashing. Nutted the FSB up to 255 and dropped the CPU multi down to 9.0 and the PC nearly blew up.

I'll increase the CPU voltage and crank my FSB back up to the 250's and then try it.

If you dont hear from me soon...... its coz I have blown me PC up with myself.

Driver 7 · Aug 3, 2003, 08:36 AM

You need to find out whats best on your system. I would 1st find what my Memory cap was.
For Memory Cap :
Lower the cpu multiplier to the lowest it will go, set memory to synchronous / 100%, and raise the FSB in increments / reboots until you find instability. Back off, test for stability in a vigorous fashion. Tweak NB voltage and vdimm to the limit of your comfort. This eliminates the cpu as a possible culprit in stability issues, since you're underworking it. You have found your maximum FSB between the memory and motherboard.

Then Find your CPU Cap
Run ASYNCHRONOUS at 50% or so, and then tweak your FSB and multiplier settings to see at what point your processor just can't handle the frequency. Tweak vcore to the limit of your comfort. This eliminates memory as a possible culprit in the overclock.

Now you're armed with a VERY good estimation of what your motherboard, processor, and memory can do. Ideally, you want to run as high a sync'd rating as possible.

Your Ram should do about 233FSB

Warpy · Aug 3, 2003, 10:23 AM

Hey Driver 7

I have set my FSB to 233 and dropped the multi to 7.0 and it booted fine and then blue screened after 10mins!

I havent set the CAS coz i didnt know what settings to use... so in our BIOS the setting is now at 'Agressive"

What do you find is best for your O/C?

dipstick · Aug 3, 2003, 11:03 AM

First I would try to find the max fsb/mem speeds by not OCing the cpu at all. This means adjusting the fsb/multiplier to keep the cpu close to it's stock speed. Also do not do jumps to 250fsb because I have never seen a stock amd board go that high. Unless your board allows you to up the chipset voltage you will not be able to run at 233MHz very easily. Also do not use aggressive mem timings because NO PC3700 can run with those. Set the manually in the bios to match whatever their rated speed is; OCZ is 7/3/3/3, Corsair is 8/4/4/3. Do not try to run this mem with anything at 2 because it WILL fail. Try going up slowly with the fsb and let us know what happens.

Kgentatszu] · Aug 3, 2003, 11:10 AM

yup, kakarot cant be wrong!~LOL, what's 'bout you driver 7, what's your scores like???

DarkFoss · Aug 3, 2003, 11:10 AM

I'd change the ram settings from aggressive to expert and manually set the timings at 8-4-4-3, from what I've from what I've read the 3700 mem is very picky about what timings it can be run at. 8-4-4-3 is Corsair's recommended according to their website. In the soft bios menu set the Cpu FSB/Dram ratio at either 3-3, 4-4, 5-5, 6-6 for it to be in sync.. All appear to be the same setting

all other's are async timings.
I've also disabled the cpu interface since it uses overclocked parameters for stability.. haven't re-enabled it yet myself but might after I finish testing my current oc for stability and see if it really matters.

Driver7 gave you some excellent advice for finding your max oc.. time consuming but it's the best way. Also remember sometimes you just can't get a certain multi stable for example you might run fine at say 217 but be unable to get 218 but then turn around and get 220. Comps are fickle, and quite unpredictable when it comes to oc'ing.

Warpy · Aug 3, 2003, 03:42 PM

Your advice is much appreicated chaps.

I'll make sure those mem timings are set correctly and experiment from there. I'll keep you updated on how i go.

Driver 7 · Aug 3, 2003, 04:42 PM

Hey Mitchelson. Your off a bit there. If your running at FSB 233x7=1631. You are a little underclocked. The AMD 2500+ is specked @ 1833 mhz. You still have room to play.
I would think you could easily get 233x8. Thats 1864 mhz, which is hardly overclocked. A 1.75 Vcore would suffice. Run your ram in Synch. 100% with your CPU. Check it out.
I would think that would be your most optimal setting. However I have only been overclocking for about 3 mths now so if someone dissagrees feel free to correct me.
Mine the mojority of the time is running @ fsb200x11=2200mhz. Ram in synch V core 1.75. Latency 4/3/2/2.0 This is where I get absolute stabili8ty.

When you start pushing it I would bet you could get your multiplier up to 9 or 9.5. May need V core pushed up to 1.8

TuEKiD · Aug 4, 2003, 07:25 AM

i will break 18,000, once i get my BGA ramsinks on (Bout 3 days), i'll pump up the memory to 400 and the core to about 430... its not gonna be hard to break 17,989...

Plus this friday im buying another 512 of Cosair memory, should be sw33t as hell...

Warpy · Aug 4, 2003, 10:39 AM

Okies I have set my FSb to 215 and CPu Multi to 10. The system is rock stable. Got 16821 in 3dmark01 which made my day!