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

    • HOLY MOTHER, did not see that one coming. if they can get Rick Moranis to participate, this will be me: https://tenor.com/5P2L.gif
    • Micron announced a $200 billion investment plan in the US by Hamid Ganji Memory chipmaker Micron Technology has announced a $200 billion investment plan in the US to bolster its chip manufacturing operations. The investment focuses on Idaho, New York, and Virginia as production and R&D hubs. According to Micron's statement, the company's new investment plan in the US includes $150 billion in domestic memory manufacturing and $50 billion in R&D operations, which can finally create around 90,000 direct and indirect jobs for Americans. "These investments are designed to allow Micron to meet expected market demand, maintain share and support Micron's goal of producing 40% of its DRAM in the U.S.," Micron said. In addition to prior investments, Micron also said it plans to spend $30 billion on building a second leading-edge memory fab in Boise, Idaho, and modernizing its existing manufacturing facility in Manassas, Virginia. The memory chipmaker firm also has an ongoing plan to build a mega fab in New York. Micron's investment brings advanced packaging capabilities to the US, enabling long-term growth in High-Bandwidth Memory (HBM), a key component in AI data centers. "This approximately $200 billion investment will reinforce America's technological leadership, create tens of thousands of American jobs across the semiconductor ecosystem, and secure a domestic supply of semiconductors—critical to economic and national security," Micron CEO Sanjay Mehrotra said. The timeframe of Micron's investment in the US has yet to be determined. Still, it could be accomplished over the next four years as the company hailed Trump's administration for facilitating the investment. Meanwhile, Micron is not the only chip maker to unveil plans to invest hundreds of billions of dollars in the US under the Trump administration. In April, NVIDIA also announced a whopping $500 billion investment in the US to produce AI servers and other related gear. Other tech giants like TSMC, Apple, OpenAI, and SoftBank have also announced massive investment plans under the Trump administration.
    • Until they add a better theme I'm not using it.
    • New Outlook for Windows is getting another offline feature by Sayan Sen Microsoft recently announced that it would block more attachment file types for New Outlook for Windows and Outlook for the Web. The company said that it is doing so in order to improve the security of its mail app. Another change Microsoft announced this week regarding attachments is better offline support for such files on its New Outlook for Windows app. The company announced it on the Microsoft 365 (M365) roadmap website under a new message ID 496371. In the description of the message headlined "Outlook: add attachments while offline in the new Outlook for Windows", the tech giant writes: "We are adding more functionality to offline mode in the new Outlook for Windows. You will now be able to add attachments while drafting your email without an internet connection." Not much else has been stated, though the entry does reveal that Microsoft expects to start rolling it out next month, July 2025. You can find the M365 roadmap message here. This is the second time offline support for attachment files is receiving an upgrade. In December 2024, Microsoft added the ability to "open attachment files" without an internet connection. The tech giant has been trying to improve offline operation on its New Outlook app for a while. Last month, Microsoft also added offline Calendar support so that internet connectivity is not necessary. The idea is to try to get more users to switch from the Classic app to the New one. Speaking of classic Outlook, Microsoft recently confirmed that a major Calendar feature upgrade has led to several bugs on the classic app, as it breaks in many ways. If you are someone experiencing problems with it, check out this dedicated article, as Microsoft has provided workarounds for several issues.
  • Recent Achievements

    • One Month Later
      Orpheus13 earned a badge
      One Month Later
    • Week One Done
      Orpheus13 earned a badge
      Week One Done
    • One Year In
      Orpheus13 earned a badge
      One Year In
    • Week One Done
      serfegyed earned a badge
      Week One Done
    • Week One Done
      fashionuae earned a badge
      Week One Done
  • Popular Contributors

    1. 1
      +primortal
      522
    2. 2
      ATLien_0
      263
    3. 3
      +FloatingFatMan
      203
    4. 4
      +Edouard
      171
    5. 5
      snowy owl
      122
  • Tell a friend

    Love Neowin? Tell a friend!