The 0507 BIOS adds a new feature in the BIOS under the "Advanced", "CPU Configuration" tab. Where there was no means to adjust CPU ratios in earlier BIOS versions, with 0507 you now have an adjustment range from 6X to 10X.

Some Conroe chips also unlock at the top, allowing ranges to about 14x. None of our Conroe chips unlocked up, but you may be one of the lucky ones who have a Conroe that unlocks both down and up.

The E6700, which runs at 2.67GHz, is very interesting because of the large headroom we consistently find at stock voltage. Once again, on the P5B Deluxe at stock voltage, the combo could run day and night at 3.4GHz (340x10) with no issues at all. At the stock multiplier of 10x, at 1.4875V the highest stable speed was 360x10 or 3.6GHz, At a reduced 9x the highest speed was 400x9, which is also 3.6GHz. With the new BIOS unlocking multipliers down, we reached 440 at 8x, or 3.52Ghz, as you can see in this screen capture.

7x allowed a further increase to a FSB speed of 494, which is where the 6700/P5B maxed out. Even at a 6X multiplier 494 seems the limit of the FSB with this CPU and board. Comparing this to our highest FSB overclock of 362 with this board in the Conroe Buying Guide we would conclude that ASUS has significantly improved the overclocking of the P5B. The ability to choose and hold lower multipliers allowed the bus speed to increase from 360 to 494.


The E6600 unlocked down with the new BIOS and allowed a new range of FSB adjustments of 405x9 (stock), 460x8, 495x7, and 495x6. Below is a screen capture at 495x7 or 3.465GHz.

Click to enlarge

While the new BIOS on the P5B adds enormous flexibility to the 965P motherboard, it should still be pointed out that on average the 965 still does not overclock as well as the Intel 975X if you compare clock to clock. You might want to look back at the 975X overclocking results in Conroe Buying Guide: Feeding the Monster for a comparison.

Index E6400 & E6300 – 2MB Cache


View All Comments

  • Visual - Friday, August 25, 2006 - link

    does the non-deluxe p5b get the same oc results?
    what exactly are the differences between deluxe and normal?
  • Gary Key - Friday, August 25, 2006 - link


    does the non-deluxe p5b get the same oc results?

    No, expect around 7x430 with a very good setup and 7x450 with an excellent setup that is stable with the E6300. The main difference between the boards is the P5B-D has eight phase power compared to three on the P5B along with the Asus heat pipe cooling technology. The P5B-D has upgraded audio, components, additional x16 PCIE slot (x2 or x4 operation), dual Gigabit LAN, and a USB WiFi option along with additional SATA ports.
  • yyrkoon - Friday, August 25, 2006 - link

    How about an article for those of us who havent OC'd in a while ? Things to test, things to change in the BIOS etc? Last truely sucsessfull OC I've personally had, was a P55 233mmx intel CPU, on a ABIT board (yes, YEARS AGO).

    Anyhow, whats the impact on a system with a dropped multiplier, and increased FSB ? I'm pretty sure the longevity of said system wouldnt be as long if run stock . . .
  • daneel3001 - Friday, August 25, 2006 - link

    I've got a P5B non deluxe with a E6600 + 2GB of Crucial Ballistix PC6400.
    As I am no expert in overclocking the only thing I tried to up was the FSB, from 266 I managed to push it to 310, before that it would crash.

    Can anybody tell me settings for say going from 2.4 to 3.0 ?
    My guess is :
    FSB to 333 so core speed is 333*9=3ghz
    Up CPU voltage to 1.4v
    ..and the thing I am really not sure is the memory setting, 1. whether or not to use spd and 2. what speed to use and maybe 3. what volt to use (the Crucial is guaranteed up to 2.2v but board is limited to 2.1v).

  • Gary Key - Friday, August 25, 2006 - link


    As I am no expert in overclocking the only thing I tried to up was the FSB, from 266 I managed to push it to 310, before that it would crash.

    Have you tried the 0309 bios yet? It improves overclocking a great deal but comes at the expense of needing "good" memory capability in order to do it. Start with SPD, raise your memory to 2.1V, use the 1:1 divider, and set your CPU vCore at 1.375V, MCH around 1.45V as a start.
  • daneel3001 - Sunday, August 27, 2006 - link

    Yep tried the 0309.

    I am currently set at :
    CPU vcore @ 1.4v but showing 1.368v on CPU-Z
    Mem voltage @ 2.1v
    FSB @ 340
    Mem @ 428 (860 DDR2).

    Not sure about MCH you mentioned.

    For some reason I can't get my machine stable past 3ghz, SuperPi will be ok but Sandra burnin will crash. I'm going to try with current settings..

  • DudemanX - Monday, August 28, 2006 - link

    I also have the P5B non-deluxe using the new 0309 BIOS.

    Core 2 Duo E6600
    ASUS P5B
    4GB (4x1GB) Corsair PC2-6400 4-4-4-12

    I wasn't looking for max overclock as this chip is so fast already so I started by turning my multiplier down to 6, FSB to 400, and memory to 1:1. Worked fine without any voltage tweaks so I started upping my multiplier. I'm now running at 8 x 400(3.2Ghz) without messing with any voltage settings. I may be able to go higher but this is more than enough to drive the single video card that this board supports and I'm quite happy.

    A weird thing I noticed is that checking the ASUS site again today(Mon. 8/28) no longer has the 0309 BIOS listed. Are some poeple having issues with it or did Intel make them remove it?
  • lopri - Friday, August 25, 2006 - link

    I can't help but to think this article is some kind of a stunt, which is in line with AT/ASUS alliance. It'd make a good Inquirer article, though.
  • Black69ta - Wednesday, August 30, 2006 - link

    I seem to remeber hearing that the Conroes would be unlocked for all grades not just the extremes but intel was going to wait to do this for a little while after launch. it seems like I heard this even before they were called Core 2 duo's. maybe Intel locked the early one so that people would have a reason to buy the Extremes, I also seem to remember the extremes would eventually get hyperthreading back, maybe as a middleground between Kentsfield and Core 2 Duo? maybe this is why nvidia is putting off releasing any intel edition 590 boards because they didn't was to spend so much money on constantly having to update BIOS and this and that while the dust settles from the launch. not to mention the reputation. If they could release the Intel 590's without any Major bugs then that would make the new "oddball" chipset maker major kudos, at least compared to the Intel and Ati chipsets. Reply
  • splines - Thursday, August 24, 2006 - link

    There's a difference between being 'in the industry' and 'clobbering people over the head with my obvious superiority and subtle hints'. If people think you're coming off as arrogant, maybe you should reconsider your approach to criticism.

    I know quite a few people who know to some very important and NDA-protected facts. None of them troll the net bashing people over the head with stuff like this, because it can get you into serious trouble.

    Secondly, you never never never ever try and come across as if you're speaking for the company.

    Ever. Never ever. Is your supposedly leet job worth you seeming like a big man on a message board?

    If you're meant to be someone of importance, you're a rank amateur at keeping your mouth shut, and a liability to boot.

Log in

Don't have an account? Sign up now