Overclocking on P5B-VM

Hello,

i try to overclock an E6600 on a Asus P5B-VM with 2x1GB DDR2-667 Infineon, but i do not get past 270MHz FSB.
I changed the mem to DDR2-533, fixed PCIe-Freq to 100Mhz, tried severeal vcores and mem-voltages but no success. Everything above 270mhz fsb and it won't even post.

The cpu and mem can at least run with 333mhz fsb, ddr2-667 @ 3.0Ghz on a P5LD2-VM SE with standard vcore and mem-voltage and a pcie-freq of 116mhz.

Anybody else with problems on a p5b-vm or any suggestions?

Originally Posted by koegs

Hello,

i try to overclock an E6600 on a Asus P5B-VM with 2x1GB DDR2-667 Infineon, but i do not get past 270MHz FSB.
I changed the mem to DDR2-533, fixed PCIe-Freq to 100Mhz, tried severeal vcores and mem-voltages but no success. Everything above 270mhz fsb and it won't even post.

The cpu and mem can at least run with 333mhz fsb, ddr2-667 @ 3.0Ghz on a P5LD2-VM SE with standard vcore and mem-voltage and a pcie-freq of 116mhz.

Anybody else with problems on a p5b-vm or any suggestions?

I have the same board, just got it today.
E6400 and Corsair TWIN2X1024A-6400 1GB DDR2-800 XMS2-6400.
So far I have tried FSB @
270 fine
271 fine
272 no post
edit: Pressed C+A+D and 272 booted into windows fine
273 fine
274 fine
275 no post.

I have some Patriot PC2-6400, but I can't even increase the FSB 1 MHz. It will only boot at whatever the default is, if I up it at all, the computer refuses to even turn on.

P5B-VM 0307 BIOS, E6600.

Hey, i have the same mobo. There was a guy from another forum that said the board did not have a PCI lock, but you said that the board can be set. I don't have memory for my setup yet, anyone care to clarify?

Thanks.

hmm...seems i'm a bit "luckier" than you guys in overclocking this board.

i managed to get up to fsb 287 on a single 1gb stick of apacer ddr2-800. but anything above that, the system won't post.

personally, i feel this is a major bummer, since the board that preceded this one, a cheap asrock 775twins-hdtv r2.0 was able to get up to fsb 322 before the system became unstable.

Originally Posted by Hexagon

hmm...seems i'm a bit "luckier" than you guys in overclocking this board.

i managed to get up to fsb 287 on a single 1gb stick of apacer ddr2-800. but anything above that, the system won't post.

personally, i feel this is a major bummer, since the board that preceded this one, a cheap asrock 775twins-hdtv r2.0 was able to get up to fsb 322 before the system became unstable.

Yeah, I'm bummed myself. What want to know is why did asus add support for a 500mhz FSB if it is such a bad overclocker?

Hey, can I join the club?

2 sticks of crucial DDR2-667
E6300, P5B-VM 0307
max fsb: 286. no matter what I do, I can't get one stinkin mhz higher. I tried everything. There is an article here: http://www.techspot.com/article/13-i...ing/page2.html
showing some ambios settings, looks like an Asus mobo, but we don't seem to have mch voltage ajustment. I tried cpu spread spectrum, tried locking pci-e at 100mhz, tried setting the drma to ddr533, and ddr667, still no go over 286. What good is a 500fsb bios update, anyone know?
Help! I want to stay in my SFF rig!

Originally Posted by LanPirate1

Hey, can I join the club?

2 sticks of crucial DDR2-667
E6300, P5B-VM 0307
max fsb: 286. no matter what I do, I can't get one stinkin mhz higher. I tried everything. There is an article here: http://www.techspot.com/article/13-i...ing/page2.html
showing some ambios settings, looks like an Asus mobo, but we don't seem to have mch voltage ajustment. I tried cpu spread spectrum, tried locking pci-e at 100mhz, tried setting the drma to ddr533, and ddr667, still no go over 286. What good is a 500fsb bios update, anyone know?
Help! I want to stay in my SFF rig!

I'm going to hold out for the next bios update, if ASUS doesn't get something working I'm going to give up on this board and move on to something that will OC.

I have switched back to the Asus P5LD2-VM SE... see here.

did you guys try upping the pci-e speed from 100mhz to say 110mhz
this worked for me on my p5ld2-vm which is at the max of 265mhz (wont go 266mhz cuz of stupid limit)

Originally Posted by Soparik2

did you guys try upping the pci-e speed from 100mhz to say 110mhz
this worked for me on my p5ld2-vm which is at the max of 265mhz (wont go 266mhz cuz of stupid limit)

I'll give it a shot, but I noticed while in XP that even with a small OC all my USB controllers were maked with a , once I dropped my FSB back down to stock they were no longer flagged as not working. So I'm guessing that the PCI bus doesn't get locked.

EDIT: Ok I was able to boot at 275FSB. with PCE at 110. I'll see how fast I can get now.

EDIT2: 300Mhz FSB appears to be my new wall. What are the problems to look for when increasing the speed of the PCIe bus?
Looking at CPUz it looks like my memory is getting overclocked, and isn't the vcore supposed to be higher?

If I drop the memory speed fromDDR2 800 to DDR2 667 in the Bios all it really does is change the FSB:Memory ratio from 2:3 to 4:5. Asus should have labled these as the different ratios they set, not as Mem speed settings.

Oh well I'm running at 2.4ghz now. Not as fast as I would like, but still at lot better than before.

Sweet! I raised my PCI-e to 110, and I'm now at 296fsb for a total on my E6300 of 2072Mhz. I tried 300 and it would not post, so I'm somewhere between 296 and 299, so far.
Is there a program to check what actual pci-e bus speed we are running at in Windows?

I just got this set up

E6400
P5B-VM
1 GB Geil PC 6400 (800 Mhz)

I have the same issue, I got it to go up to 305 FSB with the PCI-E @ 110. What is the deal with this mobo? adjust speed as you wish. It should say adjust speed as you wish and then I won't boot!


another question. I bought a new PSU and it acts all crazy.. When I hit the power button to turn it on, it comes on for about 1/4 of a second shuts off. Stays off for about a second and then turns on. And sometimes it does that when I reboot as well. Any ideas?

It seems to be a problem with the G965-Chipset.

Using a board with 945G-Chipset will result in slighty higher FSBs, e.g. 333Mhz.

The "off then reboot" is quite normal for your mainboard, this has nothing to do with your power supply.

Well you can be certain that as soon as I get a vid card I'm switching MOBOs

Originally Posted by specsen

Well you can be certain that as soon as I get a vid card I'm switching MOBOs

has anyone tried the p5b-vm with an external video card? maybe it's the onboard limiting and if it's disabled it'll help?

No change with a ATI X1900XT...

No change with a BFG 7600 GT. I thought that might be it as well. I have played with a lot of things to see if it will go higher. The highest I've gotten it to work at is 2.49, which is what its at right now and running well.

Originally Posted by koegs

The cpu and mem can at least run with 333mhz fsb, ddr2-667 @ 3.0Ghz on a P5LD2-VM SE with standard vcore and mem-voltage and a pcie-freq of 116mhz.

Anybody else with problems on a p5b-vm or any suggestions?

i have E6600 on a P5LD2-VM SE with 348 fsb ddr2-667 @ 3.132 with 1.4vcore standard
mem-voltage & pci-e set at 118. prob is i want faster 3.2+ lol