Gigabyte Ushers Breakthrough Performance of XMP DDR5-7600 and DDR5-7950 O.C with Team Group

[JustBenching]

If you calculate timings in nanoseconds, is that still true?

No, ofc not.

For ddr4 200mhz was equal to 1cas, so basically 4400c18 was equal to 4000c16 roundabout. Actually the 4400c18 was better cause the imc was also clocked by 200 mhz in the above example. With ddr5 since it works in gear 2 the imc impact will be lower.

Generally speaking when you are clocking ram you try to find the highest frequency you can boot at and then you start trying to tighten the timmings. The only way thats worth to drop frequency is if you are close to running 1t. Alderlake works at 1t up to 6400 mhz if you are lucky, so if your ram can do 6600 2t its better to drop down to 6400 1t

 

[Lesha]

I don't think chipset has much to do with it. It's a combination of the IMC and the motherboard construction (layers, and copper thickness).

Regular 6-layer 1oz copper motherboards don't seem to be able to go beyond DDR5-6200, usually rated for 6000. 6-layer 2oz copper seem to be rated for 6400 and do up to 6600.

The Z690 Aorus Master is an 8-layer 2oz copper motherboard.

Most everything I have seen on AM5 X670 or X670E is 8 layer. ASRock's cheapest X670E PG Lightning is 8 layer 1oz, while the higher models are 8 layer 2oz.

One of the new AM5 motherboards I saw was 14 layer. Might be worth a test, 14 layer vs 8 layer vs 6 layer.

How does 6-layer 2oz compare to 8-layer 1oz? I am comparing MSI and ASRock B650 motherboards respectively.

 

[RandallFlagg]

How does 6-layer 2oz compare to 8-layer 1oz? I am comparing MSI and ASRock B650 motherboards respectively.

I actually don't think there would be much difference in that comparison.

I'm honestly probably not the best person to ask on AM5, as I have Alder Lake. The brand that is good for AM5 seems to be a bit different than what I'd say for Alder Lake. From what I can tell, Zen 4 has more of an issue with the IMC lotto than the motherboard.

This thread probably is a good place to look if you want to run some high speed DDR5 on AM5:

AMD Zen 4 cpu thread

www.overclock.net