Well after having a chance to try a few boards with a QX9650 it's time to report. I've followed the pages in this Forum with interest as it covers one chip with different boards. Most interestingly, are the overclocks achieved by NapalmV5 and one or two others using predominantly Gigabyte DQ6 and EP45t Extreme Boards. As posted in other forums within Xtreme Systems, my views are not based on pure overclock numbers but the way that those overclocks translate into the speed and performance of Windows and the Application/Games within. So let's start.........
All results are with the components in my sig except when stated after the board's title. CPU speeds are kept to a reasonable constant to show the difference in boards' performance and not that particular boards overclocking ability. I've tried 3 different ( yes three !! ) QX9650's in all these boards and they all have a maximum overclock of between 4.2 and 4.4 GHz.
1. Striker 2 Formula ( OCZ ReaperX 4 gig memory & GTX280 SLi)
FSB limit of around 450. I've had four of these boards over a period and apart from the usual slight difference from one to the other, they all perform much the same. Very fast in Windows and games but limited in FSB speeds. As with all nVidia chipsets, they offer very good to excellent memory performance especially in linked and sync mode.
2. Striker 2 Extreme ( GTX 280SLi )
FSB limit of 475 with all my chips. Faster in windows than the Formula mainly due to the memory bandwidth with DDR3 and higher FSB and great to work with as everything is extremely responsive. problem with this board is that it has an awful habit of randomly rebooting or blue screening even though the overclocks are completely Prime Stable. There is another thread that address's this issue so I won't take it any further.
3. Gigabyte EP45t Extreme (Crossfire 4870X2)
With all the hype in these pages on how well the DQ6 clocks and how guys like NapalmV5 have got this board to perform, my experience has been dismal. Sure I can get the FSB to 510 @ 4.33 GHz out of my best chip Prime Stable, but the memory performance on this board is dreadful. Sure there may be a compatibility issue here with the OCZ ram I use, however the OCZ gear, from what I have experienced over the years, has the least effect on compatibility out of all the other dimms I have used. The only way to get this board to clock is to back right off the memory which is a stupid thing to do as the memory interface is what slows things down in Windows and in performance generally. What is the use of having a screamingly fast overclock when it gets bottlenecked at the memory stage ??? This showed itself within Windows where, even at 4.3 GHZ it was slower (physically) that either of the Striker's running at around 3.5GHz. if that wasn't enough, I have always used 3 RAID 0 sets. One set each using OCZ Core SS drives for OS and Data (46 gig each) and a third set for ISO images of games and apps etc which has higher storage. When you use this board with any large graphics card like the 4870, 2 of the SATA ports are rendered useless as the the card completely stops the use of these ports due to the way the SATA headers are configured on the board. Even using SATA cables with right angle plugs, it still does not allow all SATA ports to be used. Fair enough, one might say, as most people don't have a need for 6 SATA ports. Well if you want to use an IDE channel with Crossfire using the same 4870 cards, you cannot access the IDE port as the bottom card completely covers the IDE header on the board. I contacted Gigabyte Australia via my distributor and with a sympathetic ear, they informed me that this issue has been addressed in their upcoming i7 motherboards. Good to see that they have seen to this but that should have been done in the developent stages of this board. All in all, apart from the great overclocks, this board, generally, is a dud if you want more than the highest CPU overclock.
I know that some will get a synergy with this board and their own chip/ram combos so please take these comments in an open minded way.
4. Rampage Extreme
Only picked up this board yesterday. straight out of the box and especially with Vista 64bit, It is a screamer

Without overclocking anything, it is noticeably faster than Striker 2 Formula, marginally faster than the Striker 2 Extreme and bucket loads faster than the EP45t Extreme. I could almost be happy leaving this thing at stock speeds but as we are all Xtreme to certain degrees, overclocking is something that just has to be done. Based on my partners Rampage Formula which runs a QX9650 at 4Gig on air and will not let me play with it any more because she wants a machine that is hassle free and completely devoid of the chance of falling over, I cannot see any issues of the getting the Rampage Extreme over 500 FSB, but that will be confirmed over the next week.
In a post earlier in this thread, I remarked to NapalmV5 that I indeed may "Napalm the ASUS boards" and move on. Well that is certainly not going to happen at this point and especially not to a EP45t Extreme. As I custom build and sell top fight machines commercially
see here I cannot, in all honesty, recommend a motherboard that falls short of reference performance. That is why I cannot recommend the Giga board based on my
overall findings.
Rampage OC's to follow........
*** I always load any new board up with a new virgin install of Windows and not via an Image, so there is no change of OS / Driver contamination.
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