Madhsrimps artricle about tRD (performance level) on i7!

[Leeghoofd]

Very interesting Article, many thanks Saaya.

How were they able to determine the value of B2B on the ASUS board, I can't even see this timing in CPU Tweaker.
Or maybe it's present in the BIOS, I think they started to show the actual values set in one of the latest BIOS versions.

Is there any software which will show the value of this B2B setting ?

We compared the AUTO setting, which reads out as zero in the bios with manual settings. What we did was test it with Everest benchmark, superpi 1 and 32mb. Then did the manual settings on the Gene II and REX II mobo's... till we found the B2B setting that gave the +/- same results.

It really has a dramatic influence on ram bandwith ( and not really on latency like with S775 ), luckily for us I7 users there's plenty of bandwith to mess with, but we want every Mb we paied for don't we ? When being around 12 ( for eg 2000mhz action ) and dropping to 10 gave nice boost, going down to 8, the boost was not as big and so on...

I only tested the values that were 100% Hyperpi stable (8 threads) and will include them results in the upcoming Gene II review. This means that eg if we recommend a setting of 8 for daily usage (this to be bulletproof) that you can squeeze out some more performance for eg for Pi 1Mb benching purposes by dropping an increment or two.

We passed Massmans and my findings to Asus...

At least RAM manufacturers would be highly resistant about adding this setting to more motherboards.

I think it will be better to include this bios settings as it will get more performance if adjusted properly (if set too loose by the mobo's bios) and if required ( when set too tight like eg with the Asus boards) to allow more stability.



Some 32Mb and Everest screenies of the tests :

C12 Test 1600Mhz C7



C10 Test 1600Mhz C7



C8 Test 1600Mhz C7