I need help, 805-D + P5B-VM = 2.9 GHZ.

[crossroad]

System specs:

Pentium D 805 Smithfield 2.66 533 mhz. FSB.
ASUS P5B-VM Micro 965G chipset (new addition to this system)
OCZ Gold 4 x 512 MB PC5400 667 mhz.
ATI 1800xt 256 MB.
Seagaate 250 GB SATA HD
X-Infinity 500 watt SLI ready PSU 18/18 12 volt.
Latest BIOS 0613

Default FSB is 533 mhz. on the 805-D. I can not get the system to boot if I raise the FSB over 147 mhz. 20 x 147 = 2.94 GhZ. max CPU speed.

In BIOS, RAM speeds available are AUTO and 533 mhz. until I raise the FSB above 148 mhz. At 148 mhz. and above, BIOS gives me the 667 and 800 mhz. settings in addition to the AUTO and 533. Then and only then.

Note: I had this processor running at 3.5 GHZ with the exact 4 x 512 OCZ RAM DMMS in my ASUS P5LD2-VM 945G board last week. The RAM runs fine at 720 MHZ. Move to this new P5B-VM. With this new board I can get only 580 MHZ. or so out of it? I have bumped the Vcore to 1.4125 volts and the RAM max voltage is 1.95. Could the max 1.95 voltage capable be my problem?

I have tried every possible setting in BIOS including bumping up the PCI clock. BIOS does not offer a 33 1/3 PCI Frequency lock. The only thing I have not tried is removing 2 x 512 RAM. Even with the current 4 x 512 I run dual channel, but at 2T. I have tried 4-4-4-12 and 5-5-5-15. Still no boot over 2.94 GHZ.

Here is an article where the 965G chip performs as well as the 965P chips. I can not seem to get this 805-D to overclock properly on this ASUS P5B-VM board? Could it be because the Pentium D 805 is a 533 mhz. FSB CPU to begin with? The P5B-VM supports Pentium D CPU's as well as C2D and C2Q's. Need some help solving this.

Article regarding 965G chipet performance with C2D:

http://anandtech.com/cpuchipsets/sho...spx?i=2948&p=3

I bought this board to move my e6600 into when I buy a q6600 for my P5B Deluxe 965. So far, the new P5B-VM Micro board I have all the questions about has been somewhat of a dissappointment. TIA.

 

[Evilsizer]

unless asus has correct the issue which i havent read about. then the issue is is the the pci/pci-e locks do not work. even though they give you a pci-e speed setting in the bios. the only other option to get the pci/pci-e speeds to fall into to spec. you need to PEN/PAD mod the cpu to run at 200fsb. nothing else i can think of that would be causing your problem, if this were a ATX mobo i dought you would have this issue.

 

[crossroad]

unless asus has correct the issue which i havent read about. then the issue is is the the pci/pci-e locks do not work. even though they give you a pci-e speed setting in the bios. the only other option to get the pci/pci-e speeds to fall into to spec. you need to PEN/PAD mod the cpu to run at 200fsb. nothing else i can think of that would be causing your problem, if this were a ATX mobo i dought you would have this issue.

I talked with ASUS support and we did a little troubleshooting. At first, ASUS support did not want to talk with me. Overclocking is not covered under warranty, but finally a good tech over there came to his senses and we talked.

Apparently my OCZ Gold PC5400 DDR2 667 mhz. 1.9v RAM modules will run at 533mhz (slightly over) and not at the advertise 667 mhz. advertised price. On this P5B-VM 965G anyway. I had the 4 DIMMS running at 720 mhz. on an ASUS P5LD2-VM 945G micro. When I put them in this 965G, no go. I hit a wall at 2.9 GHZ. running these OCZ DIMMS at 580 mhz. maxed out. Apparently it is a voltage thing causing the problem. The P5B-VM allows BIOS adjustments up to 1.95v (the OCZ is 1.9, should work). And there is no Northbridge voltage adjustment on the P5B-VM 965G. So. I RMA'd my RAM. Might just get 'em back with OCZ saying they are fine, which I believe they are. They just would not run at full speed on this board. I may have to buy some 1.8 volt, PC6400 800 mhz. 5-5-5-15 to run on here. I still want to put my e6600 on this micro someday. Waiting to see what I get with the OCZ RM. Hoping for new DIMMS that will run at 1.8 v on the 965G chip.

The 965G boards require RAM specified at 1.8 volt apparently. You can run into problems if you have DIMMS specifying a higher voltage. All the PC6400 at 1.8 volt I see are rated at 5-5-5-15.

 

[Evilsizer]

The 965G boards require RAM specified at 1.8 volt apparently. You can run into problems if you have DIMMS specifying a higher voltage. All the PC6400 at 1.8 volt I see are rated at 5-5-5-15.

this is half true... early boards would not bootup since the default voltage on startup in bios is 1.8v. pretty much all boards now should have a higher startup voltage for the ram.... alot of the matx board still go by JDEC standard of 1.8v@5-5-5-15.

 

[crossroad]

this is half true... early boards would not bootup since the default voltage on startup in bios is 1.8v. pretty much all boards now should have a higher startup voltage for the ram.... alot of the matx board still go by JDEC standard of 1.8v@5-5-5-15.

The P5B-VM boots up fine with OCZ Gold DDR2 PC5400 667 mhz. 2 x 512 kit. That's where the fun stops. RAM speed reaches 580 mhz. and apparently go no higher due to voltage not being able to be adjusted to the DIMMS and the NB. Per ASUS and OCZ tech support. Question: Do you think OCZ warranty service will replace my 4 x 512 kis with RAM that will run on this P5B-VM 965G? Or will they just return my RAM to me?