DMB2000uk wrote:What MHz was the RAM being overclocked by (or what divider was it at)?
If you have a good chip and board, you might be able to get the PC8500@4-4-4-12 if you lower the RAM divider and push the CPU further.
DMB2000uk wrote:The second post was the info I was after, thanks.
Have you tried starting at 2.8Ghz, and upping the FSB MHz a little at a time to see at what speed your RAM fails at with the tighter timings?
As my post stated, I was at 2.8gig then jumped to 3gig; However I did notice that I can run at the low end of 2.9Ghz (323*9 = 2907), with the memory running at 978MHz, timings 4-4-4-12. I guess that means anything past 1000MHz the timings get loose. Hmmm I have to run memtest to see if this is stable, if so, I'll prpbably go with 2.9gig at 4-4-4-12
Have you also tried ruling out the NB as not being able to cope with those timings while overclocked. (To eliminate it try increasing the NB/MCH voltage a little bit to see if it will then boot).
I've bumped the MCH by .50 which is recommended by Corsair.
I take it that you are unhappy with increasing voltage to the RAM to see if it will work at the tighter timings with more voltage.
Corsair's recommended voltage is 2.2v - In fact they guarantee the RAM to run at 1066MHz at 5-5-5-18, 2.2v. So no, I havent bumped the voltage pass 2.2.
Let us know how you get on.
DMB2000uk wrote:I trust that you took the RAM down a divider to the 667Mhz one, and tried increasing the CPU core voltage?
If you want to keep the RAM running on that divider then fair enough.sygnus21 wrote:Actually, I didn't...the whole point of buying the PC8500 was so I could run the divider at 800Mhz. I don't want to bottleneck the RAM. As far as upping the CPU voltage, I was under the impression that you didn't have to up the voltage as long as you stayed below 3.2gigs. Considering the heat this thing puts out, the last thing I want to do is add more voltage! However I do have "Enhanced Power Slope" enabled.
At any rate, seems like I'll be running at 2.9gig anyway. After bumping my CPU to 3gig, I ran Memtest and it crashed/failed. Dropped the CPU to 2.9 (323*9) and memtest passed. So now I'm running 2.9gigs with mem timings of 4-4-4-12, RAM divider at 800Mhz.
If I'm missing something please let me know as it's been awhile since I've overclocked anything.
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