everything that i write is theory.. none of it is by practice, so i can't say for sure whether it'll work or not.. but on paper, it looks like it will.
first, i'll start off by talking about htt. with the base freq at 200 mhz.. there's no need to have it at any higher then x3 if you don't have pci-x. there's 2 links, the a-link and the b-link, that comprises the connection between the cpu and system. the a-link is the only bus directly connected to the cpu (minus the memory) and it handles agp and pci-x devices and the b-link. with the mult set to x4 the max throughput of the a-link is 6.4 gb/s.. the throughput of the b-link is 1.6 gb/s.. subtract the throughput of a and b and you have the bandwidth available to agp and pci-x devices; 4.8 gb/s. the max throughput of agp 8x is 2.133 gb/s, so a-link is nowhere near saturated with x3.
any device that's connected to the computer other then agp and pci-x are limited by the bandwidth on the b-link. that includes pci, ide, sata, and ethernet. any device on the pci bus is limited to 133 mb/s, which is the max throughput of pci. (i dont know crap about the via chipset.. so i'm gonna use nforce3 250gb as an example) if the board has every feature of the nforce3 250gb chipset (gigabit ethernet and 2 sata controllers) then the max bandwidth necessary would be..
-- 133 mb/s for all pci devices
-- 125 mb/s for gigabit ethernet
-- 200 mb/s for both ide controllers
-- 300 mb/s for both sata controllers
so with every device working at it's theoretical max.. the bandwidth necessary would be 758 mb/s (i did this crap on extremeoverclocking too.. and i just realized i screwed up but i dont feel like going back to changing the x3 to x2.. theoretically, htt at x2 would be suffice but the b-link comes really close to being saturated with everything at max.. x3 is still more comfortable to me).
the point of all that is that there is absolutely nothing to gain from running the htt at a multiplier higher then x3 with the base freq at 200 mhz.
now, onto the pci/agp lock thing..
if you look on the motherboard, there should be a chart for the frequencies that different dividers kick in at.. anything that has a number other than 33 for pci doesn't constitute a change in the divider.
i'm gonna use the k8t800 as a reference.. mainly because i saw a picture of the divider settings hahah. with that chipset, the divider increases by 1 on every 33 interval up to 266 mhz.. so when you overclock, you're going to want to do it in 33 mhz intervals.
generally speaking.. the max stable pci freq. is roughly 40 mhz (7 above norm).. which is about 21 mhz on the base freq. so when you overclock, do it in these intervals..
-- 200 - 221
-- 233 - 254
-- 266 - 287
if your computer freezes on the transition from the 1st to 2nd interval.. then change the mult to 8 and change the base freq to 276 mhz (if your ram can't support that high of a freq or you're not sure then set a divider on your ram). after you do that, finish up the rest of the 3rd interval. you'll be able to push it to 2.296 ghz.
if your computer freezes on the transition from the 2nd to 3rd interval.. then change the mult to 9 and base freq to 282 and do the same crap as above.
when you start overclocking.. there's a high chance that the chipset will overheat and limit you on how far you can go (especially with passive cooling).. with htt set to x3, the chipset won't overheat.
like i said before this is all theory.. i haven't actually tried overclocking in this manner nor have i benchmarked htt x4 vs x3. it all works out on paper though.. and that's good enough for me.
damn.. before i wrote this, i was all thinkin that i made a breakthrough.. but after proof-reading it i realized the insignificance and innecessity of most of my explanation, and i spent almost 30 min writing this crap too..
well.. for those that already figured this out before.. u can go - yourself, but thanks for reading! for those that got something out of my yapping.. hope it helps.
first, i'll start off by talking about htt. with the base freq at 200 mhz.. there's no need to have it at any higher then x3 if you don't have pci-x. there's 2 links, the a-link and the b-link, that comprises the connection between the cpu and system. the a-link is the only bus directly connected to the cpu (minus the memory) and it handles agp and pci-x devices and the b-link. with the mult set to x4 the max throughput of the a-link is 6.4 gb/s.. the throughput of the b-link is 1.6 gb/s.. subtract the throughput of a and b and you have the bandwidth available to agp and pci-x devices; 4.8 gb/s. the max throughput of agp 8x is 2.133 gb/s, so a-link is nowhere near saturated with x3.
any device that's connected to the computer other then agp and pci-x are limited by the bandwidth on the b-link. that includes pci, ide, sata, and ethernet. any device on the pci bus is limited to 133 mb/s, which is the max throughput of pci. (i dont know crap about the via chipset.. so i'm gonna use nforce3 250gb as an example) if the board has every feature of the nforce3 250gb chipset (gigabit ethernet and 2 sata controllers) then the max bandwidth necessary would be..
-- 133 mb/s for all pci devices
-- 125 mb/s for gigabit ethernet
-- 200 mb/s for both ide controllers
-- 300 mb/s for both sata controllers
so with every device working at it's theoretical max.. the bandwidth necessary would be 758 mb/s (i did this crap on extremeoverclocking too.. and i just realized i screwed up but i dont feel like going back to changing the x3 to x2.. theoretically, htt at x2 would be suffice but the b-link comes really close to being saturated with everything at max.. x3 is still more comfortable to me).
the point of all that is that there is absolutely nothing to gain from running the htt at a multiplier higher then x3 with the base freq at 200 mhz.
now, onto the pci/agp lock thing..
if you look on the motherboard, there should be a chart for the frequencies that different dividers kick in at.. anything that has a number other than 33 for pci doesn't constitute a change in the divider.
i'm gonna use the k8t800 as a reference.. mainly because i saw a picture of the divider settings hahah. with that chipset, the divider increases by 1 on every 33 interval up to 266 mhz.. so when you overclock, you're going to want to do it in 33 mhz intervals.
generally speaking.. the max stable pci freq. is roughly 40 mhz (7 above norm).. which is about 21 mhz on the base freq. so when you overclock, do it in these intervals..
-- 200 - 221
-- 233 - 254
-- 266 - 287
if your computer freezes on the transition from the 1st to 2nd interval.. then change the mult to 8 and change the base freq to 276 mhz (if your ram can't support that high of a freq or you're not sure then set a divider on your ram). after you do that, finish up the rest of the 3rd interval. you'll be able to push it to 2.296 ghz.
if your computer freezes on the transition from the 2nd to 3rd interval.. then change the mult to 9 and base freq to 282 and do the same crap as above.
when you start overclocking.. there's a high chance that the chipset will overheat and limit you on how far you can go (especially with passive cooling).. with htt set to x3, the chipset won't overheat.
like i said before this is all theory.. i haven't actually tried overclocking in this manner nor have i benchmarked htt x4 vs x3. it all works out on paper though.. and that's good enough for me.
damn.. before i wrote this, i was all thinkin that i made a breakthrough.. but after proof-reading it i realized the insignificance and innecessity of most of my explanation, and i spent almost 30 min writing this crap too..
well.. for those that already figured this out before.. u can go - yourself, but thanks for reading! for those that got something out of my yapping.. hope it helps.
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