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Overclocking - Getting on my Nerves

M

MLJGTI

Member
Hi all,

The story so far (Been reading everyone else's, so I thought I would give my 2 cents)

I have been reading posts about O/C for about 1 month and I decided to Upgrade my CPU from a AMD 2000+ Palo to a AMD 2500+ Barton. I received the processor yesterday and installed it, experimented about with the FSB (Multiplier Locked) and ended up achieving 190 FSB - Any higher won't post (If thats the correct term when the PC won't boot)
Anyway at 190 I ran Prime for an hour - no errors Max Temp 55C and mem test for 20 mins. I know thats only minimum time for testing - The system was stable. So turned off comp overnight, switched on and it would post?? Dropped the FSB to 180 and managed to get it working.

I am still trying to get 200 FSB but so far not successful - I have upped the DRAM Volt to 2.8 - No joy. CPU-Z Mem Timings :-

FSB😀RAM 1:1
Cas Latency 2.5
RAS TO CAS 3
RAS Precharge 3
Cycle Time 7

What is holding me back (Do I need to up the Vcore?)

Another thing that concerns me is - on my Mobo there is a chip which Reads ASUS 333Mhz FSB Support - Is this holding me back?

I realise my RAM is only PC2700 but I have read people achieving better overclocks that mine, i'm trying to think of more stuff to report back to you guys... any questions or suggestions 🙂


Mobo - ASUS A7V8X
AMD XP 2500+ @ 1.98 (FSB 180 x 11)
MB Temp 30/32 Idling
CPU Temp 45/47 Idling - Up to 55 Load - (CPU Fan 2600 Speed)
Vcore 1.65 (Actual 1.69)
Corsair 512MB - PC2700 DDR SDRAM 184 Dimm
Geforce Ti4200 64MB
Coolmaster Aero HSF (Adjustable from 1600-3800)
 
Yeah I thought it might have been - I posted a message a few days ago asking if my Mobo would be ok to O/C and somebody say it should be alright.

I notice you have the same or similiar Mobo - Can you see the Chip I am talking about? Does your say 333 or 400?

Cheer

Mark.
 
Ok, I'm not 100% sure which board mine is. I purchased it off Dabs last Feb :- SoA VIA KT400 ATX A L A7V8X-X/LAN

But on the Mobo it just reads :- A7V8X

Also CPU-Z says A7V8X Rev 1 and through ASUS Probo it confirms this?

Which board have I got??????????

Thanks Guys

Mark.
 
The A7V8X is VIA 400 chipset MB which should be fine. Here is my 2 cents. Are you running your CPU at 190fsb with 1.65vcore? If so try to up it to 1.725 +or- .025, not all 2500+ overclock to 3200+ at default vcore. Are you tring to run your DDR2700 at 190 Cas2.5? Try lowering running timing to 3,4,4,11, since not all DDR2700 will overclock to DDR3200, with the relaxed timings you will get a better change. If the timings work then little by little lower them. another option to rule out memory will be to run 5;4 fsb/mem timings. Remember your board does not have an AGP/PCI frequency lock, and will run them way out of wack at 190FSB. Once it gets to 200 then the next dividers come up, and everything on the AGP/PCI will be normal. This might also be causing difficulties, since some things are more sensitive than others. I really doubt that your CPU's limit will be 11X180 (1980mhz), and with a little experimentation you will find the culprit. Good luck, and keep us posted
 
Originally posted by: robcy
The A7V8X is VIA 400 chipset MB which should be fine. Here is my 2 cents. Are you running your CPU at 190fsb with 1.65vcore? If so try to up it to 1.725 +or- .025, not all 2500+ overclock to 3200+ at default vcore. Are you tring to run your DDR2700 at 190 Cas2.5? Try lowering running timing to 3,4,4,11, since not all DDR2700 will overclock to DDR3200, with the relaxed timings you will get a better change. If the timings work then little by little lower them. another option to rule out memory will be to run 5;4 fsb/mem timings. Remember your board does not have an AGP/PCI frequency lock, and will run them way out of wack at 190FSB. Once it gets to 200 then the next dividers come up, and everything on the AGP/PCI will be normal. This might also be causing difficulties, since some things are more sensitive than others. I really doubt that your CPU's limit will be 11X180 (1980mhz), and with a little experimentation you will find the culprit. Good luck, and keep us posted
Click to expand...


Thanks for that - I will give it a go - Fairly new to this - How do you set "5;4 fsb/mem timings"

Mark

 
Hi again,

Just checked in my bios and I don't seem to be able to alter my timings very much, current settings

FSB RAM 1:1
Cas Latency 2.5
RAS TO CAS 3
RAS Precharge 3
Cycle Time 7

I can only alter Latency to 2.0 and the others by 1 increment down, why is it so restricted? Also Divider I can't see the Divider in the bios.

Mark.

 
in relaxed timings, that means your #s will be higher.. basically so your ram isn't being pushed so hard. so maybe try:

Cas Latency 3
RAS TO CAS 4
RAS Precharge 4
Cycle Time 7

or variations on it. it may be your memory, you're asking it to run at pc3200 speeds. what brand/kind is it?

i don't think it's the mobo, i have the same one running at 200fsb. you might want to try upping your vcore, i think i had to bump mine up .5V
 
Originally posted by: adams828
in relaxed timings, that means your #s will be higher.. basically so your ram isn't being pushed so hard. so maybe try:

Cas Latency 3
RAS TO CAS 4
RAS Precharge 4
Cycle Time 7

or variations on it. it may be your memory, you're asking it to run at pc3200 speeds. what brand/kind is it?

i don't think it's the mobo, i have the same one running at 200fsb. you might want to try upping your vcore, i think i had to bump mine up .5V
Click to expand...

Hi Adams,

As I said for some reason I can't alter my timings very much

"I can only alter Latency to 2.0 and the others by 1 increment down, why is it so restricted? Also Divider I can't see the Divider in the bios."

Any idea y?

Thanks

Mark.
 
FSB-RAM 1:1
Click to expand...
getting the KT400 to 200fsb is tough enough, but you are also trying to run your 2700DDR at 3200 speed and if it's Corsair value select it's probably specteck chips which aren't great overclockers in my experience with them. I know nothing about that board, so does it allow chipset voltage adjustment? If not, you could post in the Asus forum@AMBMB and perhaps someone will have a tweaked overclocking bios for that board.
 
I can adjust the RAM Voltage from 2.55 - 2.85. I have tried upping it to 2.85 but it doesn't want to go to 200.

I don't think this is gonna happen. Its just reading other peoples posts, I'm sure some of them have done it.

Thanks

Mark.
 
The chipset voltage isn't the ram voltage, and the reason it's nice to be able to increase the chipset voltage is that since you are overclocking the FSB it helps obtain higher speeds, just as it does with the CPU&ram. It would help if you could increase the chipset voltage and run the ram at a lower speed to take it out of the mix as well.
 
Nope, the actual VIA KT400 chipset is the voltage it would be great if you could adjust. See, many of the nForce2 boards allow you to increase the chipset voltage, they call it the vdd and for users like myself who have pre ultra400 chipset nForce2 based boards increasing the vdd AKA chipset voltage allows us to hit 200FSB+ where as at default voltage we couldn't reach that bus speed. As I said I know nothing of that board and very little of the KT400 chipset but there are some serious gurus in the AMDMB.com Asus forum who will 🙂
 
Right, just went on to AMDMB and got a very quick response :-

"TLMiller is right...KT400 do usuallly get any higher 180fsb. Reason being is that KT4 mobos do not have a PCI/AGP lock...instead they utilize dividers. all KT4 mobos have a 1/5, no 1/6. With the 1/5 divider, the KT4 would be running your PCI bus at 40MHz if you set the FSB to 200.. (200 / 5 = 40Mhz )..Most hard drives don't withstand more than 38Mhz."

Bit annoying 🙁 I wish I had known before getting the processor.

Mark.


 
I feared as much, the 400 in the chipset name is somewhat misleading since it only indicates 400DDR ram support not 400DDR fsb. I have seen post by people who got their KT400 based board to 200fsb but I guess that's fairly uncommon. You know there are ultra400 nForce2 boards for around $60, you could sell your board to recoupe a good part of the investment something to think about anywho.
 
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