Overclocking q9550, RAM question

[Helgaiden]

So after a failed 771-775 mod on my brother's system (the Xeon x5470 would post and load windows but would randomly bsod like mad, regardless of what voltage I set it at), I decided to find him a q9650 and bump it to 3.33 or better to match or beat that xeon. Didn't like their prices on ebay and saw the q9550s aren't a whole lot slower but cost a whole lot less. Im thinking, maybe I can reach the same OC I was hoping for with the q9650.


So I came across this link which recommends (apparently) I use DDR2-1066 ram for the OC due to FSB constraints and limits of DDR2-800.
http://www.scan.co.uk/images/shops/intel/Intel_Q9550_Core_2_Quad_basic_overclocking_guide.pdf

Bumping the FSB to 400mhz is what will get me to 3.4ghz on the CPU, but apparently that's the limit of the DDR2-800. Should I be worried about stability issues or voltage issues on the ram when attempting to reach 400mhz? I don't see myself trying to go any further than that (which I don't think I can anyways with that RAM) so im just wondering if having DDR2-800 will be nuisance at this time.

System specs:
q6600 @ 2.4ghz (I tried OCing it, it isn't the good stepping and doesn't go very far).

6gb DDR2-800 (hodgepodged from spares: 2x2gb OCZ Reaper, 1gb PNY, 1gb Patriot. Dual channel Interleaved mode preserved, however so that's good)

Nvidia GTX 460 GPU

Asus P5q-SE/R mobo

Cooler Master Hyper T4 Cooler

Corsair Carbide 400r case

Thanks!

 

[redduc900]

You're not restricted to a max. FSB of 400MHz because your RAM is rated at DDR2-800. It's quite possible to hit speeds of DDR2-1000 or greater by either increasing the DRAM voltage and/or loosening the timings. You can also try a less aggressive NB strap (looser internal NB timings), changing from 333 to 400 for example. Also helpful at the higher FSBs is increasing NB and FSB Termination (Vtt) voltages.

 

[Helgaiden]

If all im trying attain with the 9550 is 3.4ghz at 400mhz FSB, do I even need to worry about any of those other settings with the NB and DRAM voltage then?

 

[redduc900]

DRAM voltage... probably not. A 400MHz FSB... possibly an increase in NB and/or VTT voltage. You'll just have to run a stability check w/ Prime, IBT, OCCT, etc. to find out for sure.