For some reason this is true with the newer 890 amd chip boards.
When matching the NB with HT speeds performance is increase very noticeably, for example my minfps in BC2 with my nb in sync with ht is about 110 - 115fps
But with my nb at x6 times which gives me 2190mhz HT my min fps with the same ram settings cpu oc and everything is 75 fps, Bare in mind i run 5850x2 crossfire and 4.38ghz with everything on high except shadows and effects, 16af and 2aa, All games run alot smooth when syncing the NB with the HT.
I have read it alot on here especially with the 890amd mobo's, I tried it myself and it turns out to be true, When overclocking with FSB on a 1055t its best to keep NB and HT sync on 890amd boards, but if are you going to you'd need to increase PLL voltage and NB/HT voltage.






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