Trouble overclocking E6400 on Biostar Tforce 965PT

[Tainted]

I bought this board after reading reviews of it overclocking like a champ. I was lucky I guess and recieved a C2 chipset as well.

Which perplexes me. I go into the bios, up the voltage a little (1.37) set the memory to DDR2 667, and set the fsb to 333. I exit and save, and get 2 long beep codes. upon reboot the processor is back at 266. No matter what I enter this happens.

The only overclock I've been able to get to work is the processor at 333, ram at DDR2 800. But when I log into windows and open up CPUZ it says my memory is at 500mhz.

I'm a noob at overclocking, but I keep hearing how easy it is on these processors.

I'm having trouble figuring out dividers as well. From what I've read, If I set the processor to 400mhz, the ram to 800, this would be 1:1, correct? This setting on my board causes the beep codes as well.

Any advice for me?

 

[Duvie]

That is right...

DDR2 800 means at stock speed versus stock 533fsb....That would be a 2:3 divider

533/800 = .667 or 2:3

NOw set the Fsb to 333 and guess what!!!! that equals 500 or 1000ddr2!!!

333 times the inverse of 2/3rd = 500

You need to understand the memory dividers...Set it to 667 which should be a 4:5 divider. It sets the memory at 416.67 or 833ddr2....

Anytime you start ocing you should leave the memory at stock settings to isolate the cpu...i would leave the memory at 533 or basically a 1:1 ratio to the fsb.

 

[Tainted]

Ok. I set the memory to 533, left processor at stock, its running 1:1 now.

I went back and set the processor to 333, left the memory alone, and upped the voltage a bit from stock. It wouldn't boot into windows. I then bumped the voltage to 1.4v, still wouldn't boot windows.

Then, I left the processor at 333, brought the memory to it's rated 667 speed, which should be 1:1 with the processor, and I get two long error beeps. The system shuts down, and it's back at defaults.

Am I doing something wrong? I understand the math of dividers. And my components should be able to handle a small overclock like that just fine.

 

[Duvie]

At 333fsb to have the memory run at its rated speed of 667 you need to leave the memory at 533 (which is the 1:1 divider)

What vdimm are you giving the ram sticks? remember most of these mobos are only giving 1.8v by default and that is not necessarily stock settings on most 667ddr2 and great...stet it manulaly to 2.0-2.1v...

 

[Tainted]

I've got the memory at 2.2v Thats the rated voltage for it. Crucial 10th Anniversary DDR2 667. It's also as high as this mobo goes.

Ok. I understand to leave it at 533. But why would windows freeze at loading? with the vcore at 1.4v that should be more than plenty at 333, right?

 

[Duvie]

Probably the memory...see if it works now...

 

[Duvie]

Also watch your timings....keep them loose right now...If it is cas 4 set it to cas 5....memory tweaking should come at the end, especially since cpu raw speed usuallly means more...

 

[Tainted]

I've got it at 377 1:1 right now, voltage is a tad high, but I'll go lower back down. One thing I forgot to do was change the memory timings. Would running the memory at 2.2v 3-3-3-12 @400 fsb cause windows to freeze? I'll go loosen the timings.

 

[Tainted]

Yep, just booted to windows at 400 fsb 1:1 with the timings at 4-4-4-12. Vcore is at 1.4v. Now to find out if it's stable.

Thanks so much for the help Duvie.

 

[Duvie]

No problem...and yes 3-3-3-12 would have been an issue....A lot of the boards dont seem to deal well with cas 3 timings anyways

 

[jkasten]

I just got the same board Biostar Tforce 965PT and i've been having some problems overclocking with the board too. Here are the specs on my pc:
MOBO: Biostar Tforce 965PT
RAM: PQI PC667 ram @ 2.0 v w/ 4-4-4-12 timings
PSU: Neo HE550 550w w/ 3 18A 12v rails
Graphics: pci-e 16x 7900GS 256mb

MOBO Settings:
cpu volts: 1.44375
fsb volts: 1.4 from 1.2
mch volts: 1.45 from 1.25
ram: 533mhz
ram vlots: 2.1

ram timmgs:
cas: 5
RCD: 7
RP: 7
RAS: 21

There was some other timings settings i set to 15 they started with t's i'll update the post with those.
OK got the those other timings they are:
TWR: 15
TWTR: 15
TRRD: 15
TRTP: 15

I've done some overclocking with a p4 and a Pentium D and never seem these timings settings. Anyone know what they are?


The problem is that I can not seem to go above 333 on the fsb with out getting errors when running dual prime95's. I'm setting the prime95 to in-place large FFTs and when i go above 333 it gets errors with in pass 2 or 3. I'm not complete noob to overclocking but I can't seem to find what is wrong anyone got any ideas?

 

[jkasten]

I tried so more settings to try to find out what the problem is. I was able to leave the fsb to default 266 and set my pc667 memory to 800mhz with 5,7,7,21 timings and 2.1 volts. I was able to boot fine into windows fine and run prime95 with the in-place large FFTs for one hour with out any errors. I was put my ram in a friends pc and OCed the ram to pc800 as well and run win mem daig though one pass with the ram at the same timings and 2.0 volts. So i know the ram is not the limiting factor. Ok so here is the really odd thing I set my fsb to 360 and 1:1 rato ( timings 5,7,7,21) with 2.1 volts on the ram and it does not post. Then i just went into the bios and uped the ram volts to 2.2 and it booted fine. How does that work? My ram at 720 with very high timings needs to be at 2.2 when OCing with uping the fsb but only needs 2.0 when OCing the ram to 800 when just changing the fsbram ratio? This is a very overclockable mobo i should be able to get it 400 fsb easily. Do you think there is some kind of incompatibly issue with the ram and the mobo?