Sounds like you're referring to best CPU overclocks w/ 8 GB.
Shouldn't be impossible to overclock the CPU well w/ 8 GB as long as you're running the Ram @ 1:1 or at a lower speed.
Granted, you'll need some pretty high vNB in some cases.
Now OCing the CPU & OCing the RAM high...that's a whole other nightmare.
I've managed to achieve settings that are adequate for my wishes for 24/7 operation (with 8 GB).
Q6700 @ 3.5 GHz DDR2-1050 5-5-5-18
But that's also a bit of a trick screenshot, since Prime95 (yes, even Blend mode) is actually a big fat joke for testing 4+ GB RAM stability i've discovered.
For truely stressing 8 GB, you basically have to use either HCI Memtest (multiple instances, enough to utilize all the RAM) or Linpack.
I can usually pass 100% HCI testing, though it usually errors eventually.
Fortunately, HCI is far more strenuous than anything i could ever run, so i've had zero stability issues.
The other thing that the screenie doesn't tell is that my DFI is actuallly an expensive POS when it comes to overclocking 8 GB.
(Two dimms = piece of cake. Add one more - three or four dimms - & it's garbage.)
I spent hours & hours the first few weeks discovering that it's basically impossible to run my RAM stably (including heavily underclocked) on this DFI unless i leave every single timing @ auto, which is utterly preposterous.
Luckily, auto actually works rather well since i like running 2:3 with a low tRD, & subtimings are actually quite tight...otherwise i would have thrown this board out the window.
, you're more than likely going to need more voltage to your MCH/NB to get anywhere stably with OCing (or running over DDR2-1000 even) with 8 GB.
, i had a P5B-D myself w/ this quad & 8 GB mismatched Mushkin + G.Skill.
I found that the 4:5 ratio basically is impossible to use for that combination, but 1:1 or 2:3 do work (largely due to looser subtimings no doubt).
Over 400 MHz FSB isn't your friend on that mobo either.
Stick with 9x multi, put NB voltage at 1.45v (might need higher; i didn't), & it shouldn't do too bad.
But one thing you need to remember is that on the P5B-D, the loosest tRFC it runs when you manually set timings in the bios is 42.
42 is far too tight to get anywhere w/ 2 GB dimms.
If you set the RAM to SPD though, it'll loosen the tRFC up to 51 usually, which will allow for much high RAM speeds, usually well beyond DDR2-1000 if it's good RAM.
If you have the G.Skill DDR2-800 5-5-5-15 2x2 GB PQ kit, while it's not great, if you keep tRFC loose, it should do DDR2-1000 at least, though i wouldn't count on much more.
For my kit (i have that one), the G.Skill crapped out before DDR2-850 actually if i had tRFC @ 42...but once setting to SPD (tRFC was then 51), i could do just over DDR2-1000.