Sharky Extreme's guide to P4 oc was great, except for this part:
<-quote-><font color=red>
Most Pentium 4 owners will be forced to manipulate their front side bus to overclock, since the frequency multiplier is locked. Generally, the biggest limitation to front side bus modification is the RDRAM's frequency, which doesn't like to be pushed above 900MHz. With a 133MHz bus, we'd be clocking the memory at 1066MHz - far above the accepted tolerance for RDRAM. For this reason, ASUS has incorporated an extra setting into the BIOS of the P4T to allow the Rambus memory to run at a lower ratio (3x, as opposed to 4x the FSB speed).
Using this feature, we were able to take our front side bus up from 100MHz to 130, 133, and even 150MHz! Since these values are all multiplied by four (after being quad-pumped), our final bus frequencies are effectively 520, 533, and 600MHz!</font color=red>
<-end quote->
I simply can't do the maths. Here's where I loose it:
<font color=red>"With a 133MHz bus, we'd be clocking the memory at 1066MHz"</font color=red>
133x4=532, not 1066!
<font color=red>"ASUS has incorporated an extra setting into the BIOS of the P4T to allow the Rambus memory to run at a lower ratio (3x, as opposed to 4x the FSB speed).
Using this feature, we were able to take our front side bus up from 100MHz to 130, 133, and even 150MHz! Since these values are all multiplied by four (after being quad-pumped), our final bus frequencies are effectively 520, 533, and 600MHz!"</font color=red>
multiplied by four? didn't they just lower the ratio to 3x?
Now clearly, as you can see, I'm having a hard time grasping this, could somebody pleasse explain? BTW, do I set the FSB in BIOS (my mainboard is an Asus P4T (yes, honestly!))?
---
/ Topaz
<-quote-><font color=red>
Most Pentium 4 owners will be forced to manipulate their front side bus to overclock, since the frequency multiplier is locked. Generally, the biggest limitation to front side bus modification is the RDRAM's frequency, which doesn't like to be pushed above 900MHz. With a 133MHz bus, we'd be clocking the memory at 1066MHz - far above the accepted tolerance for RDRAM. For this reason, ASUS has incorporated an extra setting into the BIOS of the P4T to allow the Rambus memory to run at a lower ratio (3x, as opposed to 4x the FSB speed).
Using this feature, we were able to take our front side bus up from 100MHz to 130, 133, and even 150MHz! Since these values are all multiplied by four (after being quad-pumped), our final bus frequencies are effectively 520, 533, and 600MHz!</font color=red>
<-end quote->
I simply can't do the maths. Here's where I loose it:
<font color=red>"With a 133MHz bus, we'd be clocking the memory at 1066MHz"</font color=red>
133x4=532, not 1066!
<font color=red>"ASUS has incorporated an extra setting into the BIOS of the P4T to allow the Rambus memory to run at a lower ratio (3x, as opposed to 4x the FSB speed).
Using this feature, we were able to take our front side bus up from 100MHz to 130, 133, and even 150MHz! Since these values are all multiplied by four (after being quad-pumped), our final bus frequencies are effectively 520, 533, and 600MHz!"</font color=red>
multiplied by four? didn't they just lower the ratio to 3x?
Now clearly, as you can see, I'm having a hard time grasping this, could somebody pleasse explain? BTW, do I set the FSB in BIOS (my mainboard is an Asus P4T (yes, honestly!))?
---
/ Topaz