Which CPU to use?

By treetops ยท 25 replies
Sep 29, 2009
  1. Hi, I have an ASUS P5N-D LGA 775 NVIDIA nForce 750i SLI ATX Intel Motherboard and the BIOS needs updating. I was thinking of just buying a cheap cpu and updating it, then swapping out the cheap for my newer CPU. I have a list of CPUs that i was looking into these three:
    Intel Pentium 4 2.8 GHz 2.8ghz CPU Processor SL8HX 775
    2.8GHz Intel Pentium 4 Hyper-threading CPU SL8PP 521
    Intel Pentium 4 HT 2.8GHz 520J CPU 1MB/800 775 SL7PR

    I was wondering which one would be the safest to go with. Thanks
  2. treetops

    treetops TS Evangelist Topic Starter Posts: 2,073   +219

    Ok just bumping it and putting in some links...
    My Mobo:
    Was wondering where i could find out exactly which CPUs are compatible with my bios version of my Mobo. I went to the vendor site,my mobo says v1.02 on the bottom of it, and at their site i don't see any of their listings of compatible cpus for this version.
  3. Jawshh

    Jawshh TS Enthusiast Posts: 392

    what cpu are you trying to put on the board?
  4. Kcircyrd

    Kcircyrd TS Rookie Posts: 216

    I think you perhaps you would benefit from some in-depth readingof the subject. If the CPU will work on your motherboard, from the ASUS specs, then you just use the ASUS BIOS. Why you think that using a cheap CPU then upgrading would benefit you or your computer, is beyond me.
    You will likely create one on which nothing will work.
  5. Technochicken

    Technochicken TechSpot Paladin Posts: 729

    According to the Newegg link, it looks like any intel CPU, Core 2 Duo or Quad, with a FSB of 1333 or less should work.
  6. Kcircyrd

    Kcircyrd TS Rookie Posts: 216

    "I was thinking of just buying a cheap cpu and updating it, then swapping out the cheap for my newer CPU. I have a list of CPUs that i was looking into these three..."

    Hard for me to figger why you would want to do this. Do you think the motherboard cares?
  7. Rage_3K_Moiz

    Rage_3K_Moiz Sith Lord Posts: 5,443   +38

    @Kcircyd, he is trying to avoid a situation where a new CPU is not recognized by the motherboard without a BIOS update. So he will use an inexpensive P4 CPU to update the BIOS to the latest version, then pop the new CPU he has bought for the board in.

    @treetops, it's a good idea, but only if the current CPU you have installed is not working (i.e. it has gone bad or is not being recognized by the BIOS) AND the P4 CPU you will buy is relatively cheap. Look here for the CPU Support list for your board. There is only one revision of the board according to the ASUS website, so this should apply to any P5N-D mobo.
  8. Ritwik7

    Ritwik7 TechSpot Chancellor Posts: 1,672   +9

    Ummm treetops, I have a P4 2.93 GHz Prescott that I'm not using (not really intending to use either). Was using it for 4 years before I built my new rig less than 2 months back. I could send it to you for free depending on how expensive it would be for me or whether it would even be feasible.
  9. treetops

    treetops TS Evangelist Topic Starter Posts: 2,073   +219

    Ok, thank you very much Rage. Yes, i'm updating my bios cause my new cpu won't work with this version, and my old CPU is not the correct socket type. Only one more Question: What's the default bios version on my MOBO? (i can't start up or anything to check it) My mobo says v1.02g on it, if that helps. This for my bro, thanks for the offer rit, but he will be getting a 15-25$ cpu off ebay. And india is pretty far away.
  10. nissanman

    nissanman TS Maniac Posts: 247

    you will need to get the Pentium 4 cpu first to be able to check your bios version. It should come up on the bios splash screen.

    Once you get the system up and running, just download the latest bios for it from the asus website. The latest bios should be newer then what your board currently has.
  11. treetops

    treetops TS Evangelist Topic Starter Posts: 2,073   +219

    Yep that's the plan, i just don't know what the default bios is... v107?
  12. Rage_3K_Moiz

    Rage_3K_Moiz Sith Lord Posts: 5,443   +38

    You can use the Mainboard tab in CPU-Z to check your BIOS version.
  13. nissanman

    nissanman TS Maniac Posts: 247

    have you tried your new cpu in the board? What cpu is it?
  14. treetops

    treetops TS Evangelist Topic Starter Posts: 2,073   +219

    Yeah i have, It's a Core 2 Quad 8400 2.66 LGA775. At first i thought i got a faulty MOBO but i asked around on these forums and i've been told i need to update my bios.
  15. nissanman

    nissanman TS Maniac Posts: 247

    Well, updating the bios is a pretty risky buisness. If you do something even slightly wrong, you could damage your motherboard.

    You could always sell your current cpu and buy an Intel Core 2 Duo E8400 3Ghz. That is an extremely fast CPU and should work perfectly with your board. It also overclocks very high (my friend reached 4.6Ghz on air with his). He was using the thermalright ultra 120 cooler with a high performance fan though.

    Oh, and the v1.02 at the bottom of your board isnt the bios revision. It is the board revision. The bios currently on your board would more then likely be v107. So if you do decide to go with the E8400, it will work fine.
  16. Rage_3K_Moiz

    Rage_3K_Moiz Sith Lord Posts: 5,443   +38

    Wait until the P4 CPU arrives, then use CPU-Z to check the BIOS revision. That'd help you know what BIOS version you have.
  17. nissanman

    nissanman TS Maniac Posts: 247

    Well, its definately v107 or higher as most of the cpu's on the support list (including the celerons) require at least v107.

    But still, Do what Rage said and check the bios revision using CPU-Z when the Pentium 4 arrives, That way, you can be 100% sure.
  18. captaincranky

    captaincranky TechSpot Addict Posts: 13,012   +2,536

    Actually, if the board in question has an "Award-Phoenix" BIOS, you can simply watch the BIOS boot screen and watch the revision number roll by.

    Under BIOS revision v.107, Asus lists only 65 nm CPUs as being supported, the "Allendale" 4xxx series being the most prevalent.


    IMHO; the Asus web site CPU is listing incomplete and/or not up to date. This because it shows a "Wolfdale" Celerons (E32 &3300(both 45nm)) as being supported w/ BIOS revision v.1101, but makes no mention of the other 45nm process CPUs that would run under the same microcode. I recommend Emailing Asus support and see what, (or if) they have anything to say on the subject.

    If money is an issue, my personal choice would be to go ahead and update the BIOS, (assuming it's not v.1101 already), and purchase the Celeron E3200 while I saved my money for the higher end C2D CPU. This particular Celeron would easily outperform any P-4 that you might be able to find.

    As has been mentioned, updating a BIOS can be a risky affair, but if you read and reread the instructions very carefully, it is do-able, and judging by the support list of the older v.107, it is necessary.
  19. mailpup

    mailpup TS Special Forces Posts: 7,188   +470

    I have a Gigabyte motherboard that has a built-in flash utility that allows the flashing of the BIOS without going into Windows or manually entering DOS. The mobo came with a BIOS that did not support the processor I installed but later BIOS versions did. I successfully flashed the BIOS to the latest version before I even attempted to install the operating system. Your motherboard allows different ways to flash the BIOS and I believe your Asus board has a similar utility. Check the manual for confirmation and procedure directions.
  20. treetops

    treetops TS Evangelist Topic Starter Posts: 2,073   +219

    Ok, Thanks for all the input. I went ahead and bought a 2.8GHz Intel Pentium 4 Hyper-threading CPU SL9CG 521 and put it in my MOBO today to update the bios. It's not giving me a beepcode or posting or anything.... Could i have a bad MOBO? (i've tested all of the other components and they are solid)
  21. nissanman

    nissanman TS Maniac Posts: 247

    Have you already updated the bios? or is the motherboard just not working at all?

    If it was working before you updated the bios, then you have more then likely done a bad flash and the motherboard will need replacing.

    If you havnt flashed the bios yet then i would try the cpu in a different motherboard if possible. If the CPU works in the different motherboard and all your other components are working fine, then youve probly got a bad motherboard.

    Did you read the motherboards manual?? Theres a possibility you might have something set up wrong aswell.

    Edit: Did you make sure all the connections are properly connected? Try re-seating all your cards, ram etc..
  22. treetops

    treetops TS Evangelist Topic Starter Posts: 2,073   +219

    No i didn't get a chance to do anything, i've never had the MOBO post for me. I've reseated everything a couple times. I read the manual a couple times through and didn't see anything. I've swapped out a working and non working video card and both times nothing different happened. It wouldn't give me a beep code for the non workikng one, where my old MOBO will. It was a pre-opened MOBO from Newegg.com that i'm having trouble with. I tried to send it back before but i had decided it was probably my CPU that was the problem because i was replacing parts on my old comp. But i ran outa money to buy a new cpu to try, and it's been way too long to send back this MOBO. Now i finally got money to get a cpu to update the bios ( i couldn't before cause i couldn't get it to post and i don't have a floppy drive) and i think my mobo is bad! :(

    Anyone have any solutions?

    I thank everyone who replied to my post you have been a great help in this endeavor
  23. nissanman

    nissanman TS Maniac Posts: 247

    id say send it back to asus to get rma'd if you can. Its more then likely a faulty board.
  24. treetops

    treetops TS Evangelist Topic Starter Posts: 2,073   +219

    It's been like 6 months since i bought it, think they'll still take it?
  25. nissanman

    nissanman TS Maniac Posts: 247

    best to email Asus and find out if they will RMA it.

    They have a 3 year warranty on their motherboards assuming you havnt removed the serial number sticker on the board. But id still email them first. But if you still have the box and everything that came with the board, theres no reason why they shouldnt.

    You cannot send it back to Newegg now as they only have a 30 day warranty on their products.

    Edit: You did buy the Pentium 4 CPU new right? and you did test it in another board?
Topic Status:
Not open for further replies.

Similar Topics

Add your comment to this article

You need to be a member to leave a comment. Join thousands of tech enthusiasts and participate.
TechSpot Account You may also...