DDR3 Ram Speed for overclocking AMD 1075t

RAM with higher clockspeed does allow for OCing headroom so your assumption is right...I use 1600 MHz for all my rigs ....It allows you to up the FSB, if needed during OCing....Check these pics out on FSB OCing result vary of course but it give you a basic look at how to get it up there...Not all BIOS are the same I realize that this is just showing some basic settings and what to look for.






Mind you I am using 1600 MHz DIMM's ...I highly suggest getting at least CAS 7 1333 MHz as that will allow you to loosen timings on the RAM to get it OC'ed up above 1333 MHz ...Take note of the voltage setting this is very important to take note of as it will increase the heat output of the chip substantially...OC'ing..requires an aftermarket cooling solution which since you are attempting to OC I assume you already have...According to my calculation your FSB is up around 252-255 MHz if that is the case your RAM is OC'ed quite a bit...Your settings to get to 3.8 on that chip would have to be something like this:

Multi.(locked): x15
FSB: 253 MHz
RAM:1686 MHz (way above SPD)
Voltages I assume you left on AUTO

awesome thanks for info. would i be best getting the faster ram my mobo can handle with cas 7 as it can be underclocked

despite the face the 1075t says it can only handle ddr3 1333Mhz

It will handle what ever your MOBO can handle...That is just the limit of how fast the IMC tranfers data thats why a lot people say just get 1333 MHz and no faster...Yet when OCing higher speed RAM allows for the FSB to be raised higher due to the RAM's ability to accomplish faster speeds...

sweet makes perfect sense, legend

tested out some faster ram , same sorta of problems, i can get it stable at 255FSB now and thats it, any more and i get blue screens. Anything i should do with HT or NB freq or voltages?

Heres current settings, stable and running cool at 41 in prime 85

http://i.imgur.com/fWMmL.png

That is probably the boards limit

got it going a bit faster read somewhere that NB should be 3 x FSB speeds, which did the trick. at 4005Mhz

FSB:267
Multi:15

Good deal..glad to see you got it going