Help, can't stablize my oc 1.6a nw+ ga-i8rxp + corsair xms pc2700

[JTKGY]

I can't get it to stablize somehow... I could run the fsb at 145 which means memory
clock of 385mhz... it would run all the sandra burn in tests fine and then the next time I
boot up I would get errors and sometime can't even get back to XP.
Now, I'm trying to see if it could stablize at 143 fsb (380mhz memory clock)...

Note:
For some reason, gigabyte's ga-i8rxp doesn't have the 4:5 host to memory clock ratio
I keep hearing about.... as far as memory clock... I could only set it to Auto, 2.0 or 2.66????
I believe that my cpu could clock higher... but my memory is dying on me (Corsair XMS pc2700 cas2.0)

Also, these are my memory and voltage settings...
memory: 2/2/2/5 15.6 usec <-- do not know what this is... something called precharge time??
voltage:
DIM = +0.3v
CPU = 1.550v
AGP = normal


Any ideas?

 

[JTKGY]

Anyone?
Any Gigabyte GA-I8RXP mobo users here?

 

[SunnyD]

As far as I recall, Gigabyte was never very well known as "overclocker friendly".

 

[Nate420]

You could try dropping your mem timings to 3-3-3-6 and see how Sandra acts. Even better, run memtest86 and see if you get any errors, memtest is pretty much the final word for testing memory stability IMO.

Barrow a stick of DDR from a friend and try it if you can.

 

[JTKGY]

Just ran some tests with memtest86...
Currently running 144fsb, 2.66 memory:host, 383mhz ddr...
Test passed (all tests once) for 372mhz (140fsb)... but failed for
385mhz (145fsb)... I'm wondering if it will pass for 380 (still testing)


I'm very disappointed with Corsair... (I got the XMS PC2700 512 CL2.0 model)...
Really thinking of returning it...

Another weird thing... although sometimes I could run o/c and doing testing for a while
w/o problem... as soon as I turn off the machine and let it sit for 10mins... restart it... it will
not even start WinXP.. .What gives?? Could it be that CPU & memory gets heat soaked so
bad that it won't even start?
Maybe I should return the motherboard and get Asus P4S333???
Ahhh!!..


Sorry.. I was running 144fsb not 143 (already corrected above)... it passed.. .Now, i'm
trying to rerun 145fsb..

 

[Barrei]

First of all your corsair is only rated for 333 mhz and your running it at 370- 380 and you wonder why its failing , secondly at 143 fsb your pci clock must be well over 40 and this can cause instability. You need to go into bios under frequency voltage control go to host/dram clock ratio and set to pll16 this will lock it to default settings. Also how high of fsb do you want? Also go into memory frequency and set your cas to 2.0 to match your latency of your corsair.Sunny d should do some research this board is very overclocker friendly if you know what your doing.

 

[gsethi]

i got P4 1.6a with this giga-byte GA-I8RXP board with Samsund PC 2100 rock solid at 150 FSB @ default voltage.

heres what i did:
make sure your PCI/AGP divider is set to PI/16 instead of normal. This will set your PCI bus to ~37.
Make sure your memory is set to 2.00 instead of Auto. This will make the memory run @ 300 Mhz (i am assuming that PC 2700 runs at 300 or 333 ?) either way, you will be at/under your limit.

That should make it run fine. It that doesnt works, it might be your CPU. Bump the CPU voltage a but, (~1.55 v) and try that.

i was able to make it boot to windows @ 155 FSB @ default voltage. @ 160 it wouldnt POST at default voltage.....will try bumping the voltage over the weekend for 160 FSB......the board is an excellent overclocker....you just have to select your settings correct.

My system is rock solid @ 150 FSB with this mobo and PC2100 ram, so yours should be too since you got pc2700......keep trying

 

[Barrei]

I made a mistake earlier, go into frequency /voltage control and set pci /agp frequency to pll16 this will lock it to 33/66then go into host/dram clock ratio and set to 2.0 to matcth your latency on your memory sticks.

 

[JTKGY]

I was hoping to run fsb of 145-150 and memory clock of around 360-370 since
many reported to run XMS at 400DDR w/o problems (though with SPD timing).

Running XMS at 300mhz (i know it will run that w/o problems) seems like a waste to me...
I would of get much cheaper ram to do that, dont u agree? 🙂

Setting pci/agp frequency to pll16 will lock down the pci and agp clock? That's what I set it
to but as I modify the fsb... both pci/agp still goes up with the fsb... (at 150fsb, it is 38/72, I believe)

 

[zzzz]

you probably need more voltage for the cpu

 

[Barrei]

PLL16 locks pci/agp to 1:2 settings so your settings will go up but shuold stay locked in that ratio, as long as your pci buss is 40 or under should be okay, keep in mind to get it to go at that high of fsb youll need to increase voltage to cpu core probably to 1.65volts and to do that you may need the brand new f7a bios {just out today} you'll also want to increase memory voltage to +.3 volts.