How to change 533MHz FSB to 800MHz FSB on Dimension 4600???

Desktop

Desktop
Desktop computer Forums (Audio, General Hardware, Video)

How to change 533MHz FSB to 800MHz FSB on Dimension 4600???

  • Hi, I just bought new ram but the manufacturer says that I must have 800MHz FSB to support them. I have a Dimension 4600 P4 3.0Ghz computer and according to the specs, it does support 800MHz FSB, although it is currently running at 533MHz.

    How do I change the front side bus speed to 800??? I tried changing it in the BIOS but it wouldn't let me.

     

  • Remove the new RAM.  Does the speed return to PC3200 (800 MHz)?

    If it does, you've purchased the wrong cache latency RAM.  All the PC3200 RAM must be CL-3 or the system will downclock to PC2700 (533 MHz) speed.

     

  • Yes, the ram is CL3 PC3200s 2 sticks of 512mb each. The funny thing is when I take out my old ram and just put these two into DIMM slots 1 & 2, it gives me an error when bootup and then nothing happens (no screen detection, no hd activity...). So, the manufacturer of the ram told me that it requires 800MHz FSB to run properly. So I was wondering how I could change that...

    Note that I also tried other ram configurations w/ and w/o the old rams. (note that i did not mix the ram, as the manufacturer also states that it is highly unwise to do so)

  • Unless the seller guaranteed compatibility with your system, it's difficult to say.  Return the modules and buy from a vendor who guarantees compatibility.

     

  • Thanks for your quick reply ejn63.

    Yes, I believe the manufacturer does guarentee compatiblitiy, but was hoping that would be my last resort.

    So to answer my question, does the Front SIde Bus speeds on Dell computers (specifically Dimension 4600) change automatically depending on the RAM supported? or is there a manual way to do that?

     

  • It is automatic; there is no way to manually set the speed.

     

  • Are you sure you have the 3.0?  The 3.06 Ghz P4 could only run at 533 and use PC2700.  I guess I can't remember for sure if Dell sold the 800 Mhz P4s in that machine or not.  You should try returning the machine to it's original memory configuration and see what you get for a FSB.  Also, the person who told you that you can't mix memory is not entirely correct.  As long as the memory is identical as far as CL Timings, speed, etc... you can mix brands and sizes and the memory will work together.  The only thing you need to be sure to do is install to identical memory modules (same brand, everything) in the same channel to be sure your dual channel configuration works.  You can find out which channel is which by looking in your machines manual online.
  • I just dug out my receipt and turns out it is a P4 3.06GHz w/ HT tech and says 533. This pretty much explains why I have this setting, but the thing that puzzles me is that I've been look at Intel's chipset configuration on Intel.com and they say that P4 processors above 2.8GHz run at 400, 533, and 800 FSB. I also confirmed with a system diagnostic tool that my motherboard supports up to 800FSB max, but is currently running at 133MHz SB (4x multiplier). My Dell Dimension 4600 was bought exactly last year btw.

    I updated the bios and chipset from intel, but it doesn't seem to work. Does this mean that there's no way to update my computer to run 800 FSB to support PC3200 RAMs? Does this mean my chipset supports 800 FSB but my processor does not? Is there firmware updates for processors? What's the difference between a P4 3.06GHz and a P4 3.0GHz processor?

    thanks in advance.

     

     



  • satchi wrote:

    I just dug out my receipt and turns out it is a P4 3.06GHz w/ HT tech and says 533. This pretty much explains why I have this setting, but the thing that puzzles me is that I've been look at Intel's chipset configuration on Intel.com and they say that P4 processors above 2.8GHz run at 400, 533, and 800 FSB. I also confirmed with a system diagnostic tool that my motherboard supports up to 800FSB max, but is currently running at 133MHz SB (4x multiplier). My Dell Dimension 4600 was bought exactly last year btw.

    I updated the bios and chipset from intel, but it doesn't seem to work. Does this mean that there's no way to update my computer to run 800 FSB to support PC3200 RAMs? Does this mean my chipset supports 800 FSB but my processor does not? Is there firmware updates for processors? What's the difference between a P4 3.06GHz and a P4 3.0GHz processor?

    thanks in advance.

    Hopefully you mean you updated with a Dell BIOS, not Intel...  Updating the BIOS with Intel's would end your warranty.  Further, you can't go back to Dell BIOS... 

    Message Edited by rickmktg on 09-28-2004 10:14 PM

    With over 30,000 posts (through early 2007), Rickmktg hasn't bought a Dell computer since July 2005, but has bought two Lenovo laptops...   

    http://www.rickmktg.com/delltalk.htm

  • Well, for the BIOS yes i used Dell's one.
  • The individual chipset may support the 800 Mhz FSB but your specific CPU doesn't. The 3.06 Ghz chip only runs at 533 Mhz.
  • Ahh no wonders. Thanks all for the replies.