So, I need to build a new machine on the cheap, and after a long period of not overclocking (the last time I knew anything about it was when I had a celeron 566), I have become a bit confused over PCI frequency locks and ratios. I'm talking about the PCI-not-express frequency here, as I don't think a PCI TV card will cope well with anything out of spec. I want to use an Intel e2200.
I'm looking at manuals for some ASUS motherboards, and all of them have under 'FSB Frequency', "Displays the frequency sent by the clock generator to the system bus and PCI bus". What does this have to do with the PCI bus, given that it's set between 200 and 800 MHz? Is the PCI frequency some divisor of this, or completely seperate?
Then I see the 'PCIE Frequency'. What's the point of adjusting this? I saw some people saying their overclock only worked if they increased this, leading me to believe it's one of those "we say it's a frequency but you're really setting a ratio" settings.
Lastly, I'm looking at this ASRock 4core1600P35. In the manual it gives a table of selectable memory frequencies at different FSBs:
FSB:----DDR2:
1600----DDR2 800, DDR2 1066.
1333----DDR2 667, DDR2 800, DDR2 1066.
1066----DDR2 667, DDR2 800, DDR2 1066.
800-----DDR2 667, DDR2 800.
I know this definitely is one of the "show a frequency but really it's a ratio" settings, and I think this means the DRAM:FSB ratios selectable are 1:2, 2:3, 3:5, 4:5, 3:4, 1:1. Is this correct?
So if I get some 1066 memory, set the DDR2 'frequency' to 3:4, and take my FSB from stock 200 MHz to 300 MHz (as an ultimate goal), the memory would be running at 300*4*(3/4) = DDR2 900, i.e. well within spec.
I thought I understood! Then I read about this board over at xbitlabs, and they seem to have this whole system reversed? Towards the end of that page it's explaining how "every 3MHz of the FSB frequency result in a 5MHz memory frequency increase". Where did I go wrong? They explain how this board is worst for overclocking low-FSB chips, but the way I worked it out, it's actually pretty good for these...
Any help understanding these issues would be great
I'm looking at manuals for some ASUS motherboards, and all of them have under 'FSB Frequency', "Displays the frequency sent by the clock generator to the system bus and PCI bus". What does this have to do with the PCI bus, given that it's set between 200 and 800 MHz? Is the PCI frequency some divisor of this, or completely seperate?
Then I see the 'PCIE Frequency'. What's the point of adjusting this? I saw some people saying their overclock only worked if they increased this, leading me to believe it's one of those "we say it's a frequency but you're really setting a ratio" settings.
Lastly, I'm looking at this ASRock 4core1600P35. In the manual it gives a table of selectable memory frequencies at different FSBs:
FSB:----DDR2:
1600----DDR2 800, DDR2 1066.
1333----DDR2 667, DDR2 800, DDR2 1066.
1066----DDR2 667, DDR2 800, DDR2 1066.
800-----DDR2 667, DDR2 800.
I know this definitely is one of the "show a frequency but really it's a ratio" settings, and I think this means the DRAM:FSB ratios selectable are 1:2, 2:3, 3:5, 4:5, 3:4, 1:1. Is this correct?
So if I get some 1066 memory, set the DDR2 'frequency' to 3:4, and take my FSB from stock 200 MHz to 300 MHz (as an ultimate goal), the memory would be running at 300*4*(3/4) = DDR2 900, i.e. well within spec.
I thought I understood! Then I read about this board over at xbitlabs, and they seem to have this whole system reversed? Towards the end of that page it's explaining how "every 3MHz of the FSB frequency result in a 5MHz memory frequency increase". Where did I go wrong? They explain how this board is worst for overclocking low-FSB chips, but the way I worked it out, it's actually pretty good for these...
Any help understanding these issues would be great
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