Discussion in 'OT Technology' started by Lynn, Oct 22, 2007.
Is the FSB located just in the processor or is it also part of the motherboard?
Motherboard. It connects the CPU to the chipset.
The front-side bus is the wires on the motherboard that you see connecting the PCI slots, the RAM, and the CPU to the two large microchips on the front of the board.
So, I upgraded my CPU from 2.8 / 533 to 3.0 / 800 and that means it will still run at 533 mhz fsb!
oh well, this cpu is faster and has 1mb cache.
That CPU you put in requires the FSB to run at 800MHz. If it's only running at 533MHz, then the CPU is only cranking out 2000MHz instead of 3000MHz.
CPU speed = FSB speed * clock multiplier.
If you're lucky, you might be able to push the clock multiplier up to 11x instead of 7.5x, where it is right now. That should put the CPU speed back up at 3000MHz, even on the slower motherboard.
- - -
EDIT: The FSB speed on your computer probably isn't really 533MHz, but only 266MHz, hence why the multiplier numbers I listed were twice as big as they look like they need to be. The FSB can exchange data with most components twice per clock tick, hence why it's listed as running twice as fast as it really does.
deuse is talking out his ass, again.
Naww... it is running faster.
I was able to rip a DVD about 5 mins faster than before.
The machine is a Dell Dimension 4600.
Do the math yourself then. Show us.
Do this yourself....
Intel Pentium 4 2.8GHz 1MB L2 @800MHz FSB. Generally would run 400MHz dual-channel DDR, 200MHz hard memory bus, 2x multiplier on memory bus, 14x CPU multiplier.
However, same mobo and CPU, but run 333MHz dual-channel DDR. 166MHz hard memory bus, 2x multiplier on memory bus, still 14x CPU multiplier... But it still runs at 2.8GHz.
The memory bus and CPU bus run ASYNCHRONOUS.
You'll get better performance out of DDR-400, still... But a 2.8GHz Prescott is still a 2.8GHz Prescott!
There is such a thing as underclocking.
yes, the entire principle of speedstep.
post a screen shot.
Interesting. So your FSB is actually running at 800MHz like it's supposed to with the new chip.
That would be why it's faster. If the FSB were running at 533MHz instead of 800MHz (i.e. 33% slower), then your CPU would also run slower. Looks like everything got sorted in the end.
exactly as I said it would
(S)he never said the motherboard could handle 800MHz FSB speed. I was operating on the assumption that this...
...meant that the motherboard could only handle 533MHz.
then the chip would not run, deuse.
don't ever take what a customer/user says at face value... you may be surprised some of the shit I've heard them say, and then when I actually take a look, the polar opposite that is actually in effect. Listen, analyze, do not trust at face-value.
oh man.. I meant to say...
So, I upgraded my CPU from 2.8 / 533 to 3.0 / 800 and that means it will still run at 533 mhz fsb?
I suppose I left out the - ? -
Since I have your attention.
I am also thinking about putting in PC 3200 RAM / 189pin to replace this 2100 / 2700 combo I have.
Any cons about doing this?
1. Yes, the chip would run on a 533MHz motherboard -- it would just run 33% slower than rated.
2. I take things at face-value when they make sense. Just because Joe User doesn't know how something works, doesn't mean that they lack the basic logic faculties to figure shit out based on what they've seen. If she still had the motherboard's FSB speed set to 533MHz, then the chip would run 33% slower. Apparently, her motherboard is set to automatically adjust the FSB speed according to what the CPU says it needs. It would have been useful to know that, but it wasn't a catastrophe in any event.
3. There's no point in using RAM that's faster than what your motherboard can handle. The FSB speed is not directly tied to the RAM speed, so you can't use that as a definite guideline. However, since the motherboard can handle a 800MHz FSB, it should be able to handle 400MHz RAM. You'll need to check the manual or the OEM's website to be sure though. And no, there's no downside to replacing mismatched RAM with matched RAM.
you don't make sense.
Dude, the whole freaking Wrong Coast doesn't make sense.
Yea, you east coasters are fucked up. It's okay tho, we forgive you.
See what I mean? There's the Right Coast and the Wrong Coast, and you don't even know which is which.
Someone post the sky is blue so P07r0457 can argue that it isn't.
the sky is blue... But the west coast > east coast.