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Trouble getting RAM to reach 1866MHz on Biostar TA990FXE mobo - Page 3

post #21 of 24
Thread Starter 
Here is what Biostar support sent me via email today:

This is a CPU memory controller limitation. Please see below AMD chart:

cid:_1_061496E4061490E00038498E482579A5
266

I'm not sure I completely understand it, but i get the idea.doh.gif
post #22 of 24
i found this on your chip...may have some information to help out smile.gif
http://www.overclock.net/t/1140459/bulldozer-overclocking-guide-performance-scaling-charts-max-ocs-ln2-results-coming
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post #23 of 24
always keep in mind...just because it isin't supposed to do it doesn't mean it won't.....after all...this is OCN thumb.gif
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post #24 of 24
Quote:
Originally Posted by mcot98 View Post

I'm not sure I completely understand it, but i get the idea.doh.gif

All it means is 1866mhz support is only provided for 1 or 2 DIMMs populated. If 3 or 4 are installed, 1600mhz is only supported and going higher than this is considered overclocking and will usually require additional tweaking. Even if you have 2133mhz RAM and say you want to run it at stock rated 2133mhz, it's still overclocking because the CPU only supports 1866mhz/1600mhz. Just like back in the days of AM2+ I remember Phenom II supported DDR2 1066mhz for up to 2 DIMMs and 800mhz for 3 or 4.
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