Originally Posted by
saaya
im 100% sure its the IOH, some intel people told me they focussed too much on the cpu and made it as flexible and as ocable as possible, but the ioh group caused them a lot of problems. first they tried to force a reference clock buffer in the ioh which means a cleaner 133mhz clock but totally messes up the clock signal if it goes higher than that, then they limited the ioh to qpi 18x...
the first could be fixed, luckily, otherwise wed be stuck at 145bclock or so, the latter couldnt be changed since it requires a redesign and it would actually ruin the 965 sales since higher than 220 bclocks means a 920 pretty much clocks the same as a 965. well almost... under cold you cant reach that high bclocks so a 965 would still be the best for ln2, but yeah... intel is affraid to lose 965 sales afaik.
and yes and no, its a hardware thing to have the qpu multi limiting us, but its a sw thing as well. but a software improvement will only get us a little higher, like on dfis board... they can boot with 225 and run stable at around 230, same for evga, maybe a tiny bit more even, ive seen suicide shots of 240.
thats done by tweaking the timing code that adjusts the cpu and chipset during bootup. so you can get an extra 10mhz or maybe 20mhz from that, but thats it... and if its really stable longterm is another question... if we want a really higher bclock we need lower qpi multipliers or a chipset that can run higher qpi clocks than 4ghz
but intel killed off via and sis, nvidia doesnt have a license, serverworks doesnt have a license, ati stopped making intel chipsets, uli was bought by nvidia... so there is just one chipset left for intel... their own... which means they can do whatever they want now :/
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