Need help, brick wall over 220 FSB

L

lRaphl

Weaksauce
Joined
Sep 3, 2003
Messages
101
First thing first, here is the system spec:
P4 3.0E (SL79L) - WC
Gigabyte GA 8i875 Ultra
OCZ EL DDR PC-3200 Dual Channel Platinum Rev 2 (2x512MB, TCCD)
600W Power supply

This is the first time I'm trying to overclock since my old, and now dead 4 years ago, K-2 350@550 (the poor thing lasted 2 years! ;) ). I know my MB may not be an overclock killer, but I'm sure I can get a lot better than this. Here is the numbers I get:

@ 220MHz
2-2-2-5
vDimm: 2.6V
vCore: stock (1.3875, but MBM report 1.47 and GB utility report 1.49)
vAGP: 1.5V

@ 225+MHz
Post, but memtest errors everytime

Tried:
vDimm 2.7V, 2.8V and 2.9V
2-2-2-5, 2.5-3-3-6, 2.5-3-3-7
vCore: up to 1.5250V (1.5250V is reported as 1.59V with MBM)
vAGP 1.6V and 1.7V

You can combine all this together, nothing work. memtest fail in test #3 first pass everytime. Since I'm able to run this thing @ 220MHz 2-2-2-5 2.6V rock solid, there must be something to do with it to go higher?
 
My BIOS isn't giving me the CAS 3 option. Pretty stupid I know, but can't move more than ±0.5 of SPD and SPD is 2. If SPD is 2, can only do +0.5, and if SPD is 3, can only do -0.5.

BTW, I also tried to disable the "Top Performance" option, don't work either.
 
Tried 221MHz and still no luck. So 220MHz is really the higher I can get right now. I really don't know what I'm doing wrong.

There is also something weird...
@DDR400, memtest memory BW = 3289MB/s
@DDR440, memtest memory BW = 2871MB/s

Should I put some heatsink on the regulators??
 
Yes, I tried 225MHz with 1.66 multi instead of 2.0 (mem @ 374MHz) and the system wont boot.

An other wierd thing is @DDR400 2.5-3-3-7 I'm getting errors in memtest but @DDR400 2-2-2-5 there is no problems at all...

I'm strating to be confused about all this. My board is the same thing as the GA-8KNXP without the DPS2 thing and I saw reviews of 8KNXP hitting 282MHz FSB. I'm not looking to hit this mark, but still....220MHz is like doing nothing at all, I don't feel it's worth it if I can't go higher. ;)
 
I have ballistix that act very similiarly. When I set a 5:4 I have to knock the ram volts to 2.55 or 2.6 or I don't even post. It will 2-2-2-5 upto 214fsb 1:1 but at 5:4 it has to be 2.5-2-2-6 or no post, and it doesn't like oc with 5:4.

1:1 it goes 256fsb @ 2.90V.

Go figure. I say keep trying different timings, volts and dividers. Try to make sure you can get the cpu higher.

Other timings to try

2.5-2-2-8
2.5-4-4-8
2.5-3-4-8
2.5-3-3-8
2-3-2-6
2.5-3-2-6
2.5-3-2-8


LKS
 
Isn't x-x-x-8 will put my memory in 2T mode instead of 1T?? I think I saw something about Intel board putting memory in 2T with x-x-x-8+ settings...I could be wrong that it wont surprise me! ;)

On the CPU side, people with 3.0E (SL79L) seems to be able to hit 4GHz most of the time. Again, I'm not looking to hit this mark, but 3.75 (15x250) would be good enough for me. I'm also starting to think my PSU could be a problem since it's a cheap PowerTek. But I checked 12V and 5V with my multimeter and nothing was wrong.

+12V -> +12.06V to +12.18V
+5V -> +5.06V to +5.08V

Anyway, I will try other settings like you said and give some feedback!

Thank you!
 
Ok! Here is some results. It look a little bit more interinsting.

DDR400 @ 2.6V vdimm:
2.5-2-2-6 -> memtest freeze, system wont boot and making lots of short beeps
2.5-2-2-8 -> memtest freeze, system wont boot and making lots of short beeps
2.5-4-4-8 -> OK
2.5-3-4-8 -> Errors
2.5-3-3-8 -> Errors
2-3-2-6 -> OK
2.5-3-2-6 -> Errors
2.5-3-2-8 -> Errors
2-2-3-6 -> OK

In this part, everytime my memory BW was going below 3200MB/s, there was errors.


DDR440 @ 2.6V vdimm:
2.5-4-4-8 -> Errors
2-3-2-6 -> OK
2-2-3-6 -> OK


DDR450 @ 2.6V vdimm:
2-3-2-6 -> Errors
2-2-3-6 -> Errors


DDR450 @ 2.8V vdimm:
2-3-2-6 -> 1 memtest pass error free!!
2-2-3-6 -> Errors


Now I need to test more and see what it does after some hours of memtest. @225FSB, my +12V and +5V were still good (like in my other post). It's still wierd that lower timings gives me errors in memtest :confused:
 
I'm glad to see you are having different results, keep at it!

(My 2.4 won't run anything stable over 243fsb, with Volts from stock to 1.6 . I can't count how many people I have seen with huge oc's with no extra Volts. Thats why I have a new mobo coming. I've replaced the psu, ram, cooling, and whatever else i could replace with no help, mobo is next. If my oc is still unaffected then my chip is a pos with low OC.)

A good psu can't hurt.

And don't forget to try

2.5-2-3-6
2.5-3-2-6
2.5-2-3-5

Etc. etc. etc.


LKS
 
tccd is VERY sensitive to voltage.
find the max speed at 2.6v.
then 2.65
then 2.7.. ect

it's possible that your optimal settings may overclock better with less than the max voltage.
 
I know it's sensitive...this is why I've been testing @ 2.6V and upped only to see if I was able to get something more from it. Only voltage I have acces for my ram is 2.6V, 2.7V, 2.8V and 2.9V. On OCZ website, they say this memory should be run @ 2.75V but it work great @ 2.6V, so I keep it as low as possible! ;)

More to come on this next week, going to a LAN this weekend, so no tweaking, the rig must work if I want to kick some ass! :p
 
ah, all right. i assumed you just bumped it up to 2.8 when i saw the post that only had 2.6v and 2.8v results.
 
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