AN8 + AMD 3000+ Venice Core

[RedDevil]

Hi,

After reading the reviews of both the AN8 fatal1ty and AMD 3000 Venice I decided this would be the first atempt at OC the system.

Read your review with others but am really at my wit's end trying to overclock anywhere near the 50% you did.

The best I get it to 2.1g from 1.8g using the following

HTT FREQ 3
DRAM down to DDR266
NFORCE Chipset from 1.5v to 1.65v
HTT to 245

If I go any further than 245HTT my system hangs or reboots.

Please any help would be gladly accepted.

[BUFF]

You shouldn't need to touch the chipset voltage at all - I can do 320HTT (haven't tried higher yet) without touching it & chew* @ Abit forums did 395 without changing chipset etc. voltages.

What BIOS are you on?
Is that XMS3200C2, XL etc.?
What is your Vdimm & mem timings are what?

[RedDevil]

Hi,

BIOS v16 dated 12.7.05, Memory TwinX1024-3200CTP2

VDimm / Mem !?!?!?!?! I'm new to OC

Should it be rebooting my machine at HTT240?

[BUFF]

VDimm / Mem !?!?!?!?! I'm new to OC

Should it be rebooting my machine at HTT240?

Vdimm/ DDR SDRAM Voltage is the voltage that is supplied to the memory - the board typically defaults to 2.6V which isn't enough for a lot of memory. Try 2.70V.
Also make sure that DDR VTT is 1/2 that of the Vdimm - there actually is a /2 setting.

It's too late to write a long post about timings - I'll get to that later in the day.

No, it shouldn't be rebooting at 240HTT.

Are you on stock cooling?

& check out the forum at ABIT-USA

[Napolean_D]

Hello,

I have the AN8-SLI(bios 17), The first A64 i used was a 3200 venice and i couldn't get a stable clock past 2298mhz at 1.55v. I could get it to 2400mhz, but it would reset on a cold boot.

I was beginning to lose faith in the board, until i changed to new OCZ 2Gb PC3200 Platinum RAM and an opteron 148 at the time of fitting watercooling.
On stock volts i could get to 275 x 11 (3000mhz) on a 333 divider, more volts and it will do 282 x 11, slightly unstable so i'm happy at 275.

I was frustated initially (probably how you feel now) but am happy now with my opteron

[RedDevil]

Guys,

Thanks for the replies.....

I'm using the standard heat sink that came with the AMD and proly not using the right PSU atm either.

I tried, setting the DDRV to 2.7 and DDRVTT to 1.35, moved the HTT to 240 and the machine just rebooted.

to be honest i'm a little unhappy with the sticks of corsair I have, if I ever loose the bios settings I have to remove 2 sticks just to get in the bios.....

another question i have, is the RAM is running DDR400 do i have to reduce this?

should using the UGURU windows appp work, or should i be doing this in the BIOS?

Thanks again guys

[jimborae]

Guys,

Thanks for the replies.....



to be honest i'm a little unhappy with the sticks of corsair I have, if I ever loose the bios settings I have to remove 2 sticks just to get in the bios.....

another question i have, is the RAM is running DDR400 do i have to reduce this?

Thanks again guys

Err does that mean that you're running 4 sticks?? Cos if you are that wont help in your overclocking adventure.

Also yes, if your memory is a bit pants you should lower the memory divider. i.e. try running it at DDR333. It's speed will increase proportionally as you increase the cpu fsb.

[RedDevil]

yes 2 dual pairs of 512m = 2g

[BUFF]

another question i have, is the RAM is running DDR400 do i have to reduce this?

should using the UGURU windows appp work, or should i be doing this in the BIOS?

I though that you said that you were using the 266 divider?
I doubt that RAM will do 240 which would explain your problem.
If you are using 4 sticks you probably want to set Command rate to 2T.

uGuru works but you are probably better with Clockgen.
Oh & probably disable Cool'n'Quiet too.

[RedDevil]

Buff,

Thanks for the informative info.

I am using 2 sets of TWINX1024-3200C2PT are these not good enough?

Type = DDR-400 (XMS-3200C2)

Latency 2-3-3-6

ah, after looking into it the RAM is 200mhz (DDR400) Thus when I overclock to 240HTT it's already pushing the RAM over the 200mhz

is that right?

[BUFF]

If you aren't using a divider then when you are running 240HTT your RAM is also running at 240MHz (DDR480), way above it's specified speed.

[RedDevil]

m8 sorry to sound stupid, but how do i use a divider on RAM

[BUFF]

See in http://www.3dnews.ru/documents/10068/bios_memory.jpg where it says DDR timing selectable? Put it on User Define/Manual & in the DRAM Clock field below select 333.
Save & exit of course.

You should now be running the 333 divider so that at 240HTT your RAM will be ~196 so you should be able to push higher.
If you max that out drop to the 266 divider.

[RedDevil]

Buff,

I tried the above and could only push the HTT to 250, even with the DDR divider set at 333.
I even resorted to removing 2 sticks of dual channel ram.....

Still rebooted

[jimborae]

Er hold on a mo. Buff, doesn't the AN8 have well documented issues with Corsair ram???

I'm sure I remember reading about folks having troubles with it over on the Abit forums & that bios 18 helped in this regard for some people, Buff can you confirm or deny this?

[RedDevil]

Just for info I am now on Bios18 and still have the same issue