Auto for PCIe frequency SHOULD be 100...But thats not necessarily the case with GIGABYTE boards based on the P45 chipset. If it's manually set to 100 then the doubt about it's frequency is moot. Gigabyte EP45-DS and -UD boards can have OC stability hassles with the auto setting- quite the opposite of what you've heard The RAM profile you already have will be either the standard JEDEC profile (usually with loose timings) or an XMP profile if they're running at 1066 automatically. I assume you have the F2-8500CL5D-2GBPK kit- if so they should run ok at 1100 - you may need to push through a big voltage for it to be stable tho 2.1-2.2v. -don't know if you can keep them at 5-5-5-15 timings tho. What is your Channel A/B Static Read Value (under the advanced timing control tab- or use Memset which calls it "Performance level") ? if you need to have it at 7 or higher then you're wasting your time having the RAM clocked high and you will be better off running your RAM at 1:1 with your FSB -this should allow you to run around 850-900MHz at 4-4-4-12 and a perf. level of 6 or 7 -also you wouldn't need to overvolt. If you're in any doubt or want further verification I'd check out the main/official Gigabyte forum over at Tweaktown. With a bit of patience you should be able see some nice timings with 2 x 1Gb sticks. I just pulled up old screenshot from my backup computer (see attachment) that runs Q9400/EP45-DS4P/Crucial 2x2Gb Tracer DDR2-800 and running at 1000 to give you an idea of the timings you should achieve (or better)- the perf level is set at 8 as I hadn't yet finished with the OC'ing- I reset the memory latch to 2.00D once I reached 425FSB. Also note that tWTR and tWR in Memset is your BIOS value PLUS 8 if using the 2.66B/D memory latch, or PLUS 7 if using the 2.00B/D latch, i.e. if your BIOS says tWTR = 3 then Memset will list it as either 10 or 11. Keep your current BIOS profile and save a few of the stable profiles that you create - for instance 400FSB/400 mem, 400FSB/533 mem at the best timings you can achieve. During oc'ing DISABLE "XMP" (under the advanced clock contol tab) ,leave (G)MCH latch at "Auto" and if your DRAM Voltage (under the MCH/ICH tab) isn't at 2.0 - 2.05volts (i.e.set at JEDEC's 1.8v) then you will most likely need it if your running the RAM I quoted earlier.