Examplary components:
Pentium IV 2.4 Ghz Northwood B 533 FSB
Asus P4P800 AI
Samsung DDR 400 Mhz.
Technical Details:
1. The motherboard made by ASUS allows the CPU to run at 533 Mhz FSB
2. Samsung DDR 400 Mhz is then connected along side with the CPU, however some limitations were found.
Technical Problems:
1. P4B 533 Mhz FSB is quad-pumped architecture, 4 x 133 Mhz. And ASUS motherboard handles this in a perfect manner.
2. The problem lies within the link between CPU's FSB and Memory's clock speed.
- ASUS P4P800 AI automatically adjust or under-clocks memory's clock speed down to DDR 333 Mhz, 2 x 166 Mhz.
- BIOS excludes an option of having a clock speed of 400 Mhz for a ram module.
The part I don't get is, why does the motherboard underclock my DDR 400 Mhz down to DDR 333 Mhz? Where is the link hidden behind this?
For all the intel fans out there, can you please guide me the details of how intel chipsets/fsbs/memory clock speeds work?
Thanks
The HIGHLY TECHNICAL forum is not for troubleshooting.
AnandTech Moderator
Pentium IV 2.4 Ghz Northwood B 533 FSB
Asus P4P800 AI
Samsung DDR 400 Mhz.
Technical Details:
1. The motherboard made by ASUS allows the CPU to run at 533 Mhz FSB
2. Samsung DDR 400 Mhz is then connected along side with the CPU, however some limitations were found.
Technical Problems:
1. P4B 533 Mhz FSB is quad-pumped architecture, 4 x 133 Mhz. And ASUS motherboard handles this in a perfect manner.
2. The problem lies within the link between CPU's FSB and Memory's clock speed.
- ASUS P4P800 AI automatically adjust or under-clocks memory's clock speed down to DDR 333 Mhz, 2 x 166 Mhz.
- BIOS excludes an option of having a clock speed of 400 Mhz for a ram module.
The part I don't get is, why does the motherboard underclock my DDR 400 Mhz down to DDR 333 Mhz? Where is the link hidden behind this?
For all the intel fans out there, can you please guide me the details of how intel chipsets/fsbs/memory clock speeds work?
Thanks
The HIGHLY TECHNICAL forum is not for troubleshooting.
AnandTech Moderator