Recommended Posts

If you are running single channel DDR400....you wont get max use because its not running the 533Mhz that it should.

If you are running Dual Channel DDR400 then it will - as it willl be able to run any CPU up to 800mhz FSB without any bottlenecks.

If you ARE using dual channel - it will downclock to dual channel DDR266 - as 266*2 = 533mhz (DDR266 was designed for the 533 bus P4)

EDIT: Make sure your mobo is compatible with the DDR400 memory. Though it should work.

Edited by absolutemaxpayne.co.uk
  Iluvatar said:
The 533mhz FSB operates with 266mhz DDR i believe. no problems with anything higher though.

My 533mhz FSB supports PC2700 or DDR333 memory...

You should find in the BIOS to set the speed of memory higher than 266 or 333... not sure that 400 is an option but I know you can set it higher.

You do not need DDR333 or DDR400 to run a P4 533Mhz bus.. It needs dual channel DDR266, thats final. Anything more than that is a bonus for overclocking. Anything less is just a bottleneck.

Only the latest Pentium 4's have a quad pumped FSB, not the 533mhz revisions.

200*4=800mhz fsb. Thats why we need DUAL channel DDR400 so that It reaches the 800mhz the chip requires.

This is how I would like to think of it:

Dual channel DDR266 was designed for the P4 533mhz.

Dual channel DDR400 was designed for the P4 800mhz.

Single channel DDR266 was designed for the older Athlon chips (Thoroughbred - 266mhz fsb)

Single channel DDR400 for the newer Athlon chips.

Single channel DDR333 is for the later Athlon Barton chips, which actually ran at 333mhz.

Note: There is no Dual channel DDR333 because no chip runs at 666Mhz FSB!

The reason why i was asking was because my MB died a couple of days ago. I do NOT have the money to buy the more exspensive stuff right now. So I need one that is cheap but works fine and that I can buy it new. So I was looking at a board with the i848P chipset. Is anyone familiar with that chipset and does it support dual channel ddr? I saw a MB on newegg.com and it seems to support it. Although, I am not sure. Can anyone tell me? Thanks for your help.

  absolutemaxpayne.co.uk said:
You do not need DDR333 or DDR400 to run a P4 533Mhz bus.. It needs dual channel DDR266, thats final. Anything more than that is a bonus for overclocking. Anything less is just a bottleneck.

Only the latest Pentium 4's have a quad pumped FSB, not the 533mhz revisions.

200*4=800mhz fsb. Thats why we need DUAL channel DDR400 so that It reaches the 800mhz the chip requires.

This is how I would like to think of it:

Dual channel DDR266 was designed for the P4 533mhz.

Dual channel DDR400 was designed for the P4 800mhz.

Single channel DDR266 was designed for the older Athlon chips (Thoroughbred - 266mhz fsb)

Single channel DDR400 for the newer Athlon chips.

Single channel DDR333 is for the later Athlon Barton chips, which actually ran at 333mhz.

Note: There is no Dual channel DDR333 because no chip runs at 666Mhz FSB!

Xeons have a bus of 667MHz.

  absolutemaxpayne.co.uk said:
You do not need DDR333 or DDR400 to run a P4 533Mhz bus.. It needs dual channel DDR266, thats final. Anything more than that is a bonus for overclocking. Anything less is just a bottleneck.

Only the latest Pentium 4's have a quad pumped FSB, not the 533mhz revisions.

200*4=800mhz fsb. Thats why we need DUAL channel DDR400 so that It reaches the 800mhz the chip requires.

This is how I would like to think of it:

Dual channel DDR266 was designed for the P4 533mhz.

Dual channel DDR400 was designed for the P4 800mhz.

Single channel DDR266 was designed for the older Athlon chips (Thoroughbred - 266mhz fsb)

Single channel DDR400 for the newer Athlon chips.

Single channel DDR333 is for the later Athlon Barton chips, which actually ran at 333mhz.

Note: There is no Dual channel DDR333 because no chip runs at 666Mhz FSB!

400mhz FSB = 100x4

533mhz FSB = 133x4

800mhz FSB = 200x4

All Pentium 4's are quad pumped FSB.

Put a 533mhz chip on a board with dual channel memory and it will take DDR333 running in dual mode

Put an 800mhz chip on a board with dual chanel memory and it will take DDR400 running in dual mode

Why is it so hard to beileve this? I have 333 memory on my 533 FSB chip and its recognized and runnning at 333...

"Note: There is no Dual channel DDR333 because no chip runs at 666Mhz FSB!"

- Put a 533 FSB chip on an 800 FSB motherboard and you will be able to run DDR333 in dual channel mode.

  PCKing said:
Why is it so hard to beileve this? I have 333 memory on my 533 FSB chip and its recognized and runnning at 333...

Yeah, I didn't say that it wouldn't work, im saying that it is not neccessary. Like I said, anything is a bonus over DDR266 because 266*2 = 533.

  Quote
- Put a 533 FSB chip on an 800 FSB motherboard and you will be able to run DDR333 in dual channel mode.

Again, it will run DC DDR333, but it still doesn't need DC DDR333. It only needs DC DDR266.

fsb = 133 MHz x 4 = 533 MHz bus

Dual channel allocates each memory stick it's own channel to operate on rather then sharing one channel. You can think of it as a 3 lane road being expanding into two 3 lane roads; the ultimate purpose being to alleviate any bandwidth limitations that might occur while using single channel. Dual channel has nothing to do with memory operating frequency. DDR266 can operate in both single channel and dual channel assuming the motherboard allows it, it does not increase to DDR333 in dual channel.

To answer the thread starter's question. PC3200 (DDR400) will work perfectly fine with a P4B, it will just run at a slower clock speed. Memory can always run at speeds less then what it was made for, it cannot be run at speeds greater then what it was meant for. The only thing I'd suggest is you use a newer motherboard that supports all the cpus for compatibility reasons. Some of the older motherboards may have trouble with newer and faster ram.

This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Posts

    • I just teams to stop stealing the damn focus every time it starts or restarts after an update. Annoying as all hell.
    • Obviously new hardware costs more money. Never said you get new 2025 hardware for $266. You get new 2025 hardware for as little as $399 and only gets better with back to school sales. At the $499-699, there's some decent spec laptops with 16 GB RAM, and 1 TB SSD with better build quality than this lowest end ideapad.
    • FxSound 1.1.34 Beta by Razvan Serea FxSound (formerly DFX Audio Enhancer / FxSound Enhancer) is now free, making high-quality audio enhancement accessible to everyone. Designed for all PC sound systems, from average setups to audiophile-grade equipment, it offers automatic or fully customizable processing. As automatic or customizable as you want, it utilizes the highest-grade processing to deliver more volume, better equalization, and a wider, deeper sound. For the serious audiophiles, FxSound gives you the tools to adjust the FxSound Effects and EQ to your exact preferences. Turn FxSound on and immediately hear the difference in sound quality. FxSound is ideal for budget audiophiles, music lovers, gamers, transcriptionists, Netflix enthusiasts, and more. It’s particularly beneficial for those relying on quiet laptop speakers or low-quality audio hardware. As a free tool, FxSound excels in boosting volume, enhancing bass, and improving sound quality. No other free EQ for Windows matches its ease of use. FxSound Is Now Completely Free and Unrestricted FxSound Pro is now free for everyone, not just those who can afford it. Get free and unrestricted access to better sound today. FxSound is now entirely supported by users. Click here to donate to help fund continued development and improvements to FxSound. FxSound 1.1.34 Beta changelog: System tray context menu width is fixed and device names are adjusted to width Prompt to save the preset in a new name if changes are made and new preset is selected If preferred device is not connected then it is disabled and greyed out from selection until connected again Application crash dump is saved on unhandled exceptions Download: FxSound 1.1.34 Beta | ARM64 | ~70.0 MB (Open Source) View: FxSound Home Page | Screenshot Get alerted to all of our Software updates on Twitter at @NeowinSoftware
    • Can you get a brand new (not refurb) device like this, but with 2025 hardware, for $266? Under $300? No? If you can, it must have the worst specs otherwise (4gb ram, 1366x768 12in lcd screen, 256gb spinning hard drive, etc.). Please show me this sub-$300 2025 laptop that is better than what the article shows.
  • Recent Achievements

    • One Year In
      TsunadeMama earned a badge
      One Year In
    • Week One Done
      shaheen earned a badge
      Week One Done
    • Dedicated
      Cole Multipass earned a badge
      Dedicated
    • Week One Done
      Alexander 001 earned a badge
      Week One Done
    • Week One Done
      icecreamconesleeves earned a badge
      Week One Done
  • Popular Contributors

    1. 1
      +primortal
      569
    2. 2
      +FloatingFatMan
      187
    3. 3
      ATLien_0
      187
    4. 4
      Skyfrog
      113
    5. 5
      Som
      109
  • Tell a friend

    Love Neowin? Tell a friend!