The Asus AM5 boards seem unusual. They have four RAM slots but don't support the high-speed configuration.
The Asus AM5 boards seem unusual. They have four RAM slots but don't support the high-speed configuration.
Hi all!, I'm so confused right now... I was thinking in buy an AM5 motherboard, with ECC, taking advantage that the AM5 now supports 128gb of ram! But...., after check, check and check on the Asus AM5 motherboards (all the asus ones support ECC) I notice.... the min frecuency that supports is.... 4000Mhz, I have talked with Asus tech support by mail, and this is min speed that is actually supported. Oks, but what is the problem? Almost all of the Ryzen 7000 Series, when we use 4 slots of ram, the CPU can only go to.... 3600Mhz! the only exception is the 7600X which only supports 2 slots. So... can someone explain me... what happens here? well is not like is will not works, but this means we can only use 4 ram slots with unsupported speeds, which is weird.... Example (there is a lot of them): https://www.amd.com/es/products/cpu/amd-ryzen-9-7950x https://rog.asus.com/latin/motherboards/...ero-model/ Thx!
It's complicated. DDR5 is exclusively available in daisy chain memory topologies, and daisy chains don't like 4 DIMMs of RAM. Both AMD and Intel have significantly lower max memory speed when running 4 DIMMs because of that. Plus there's the argument of there being extra memory ranks, with the more memory ranks you have in a system the harder time the memory controller has running high frequency. With 4 dual rank DIMMs, you're running quad rank and therefore putting a ton of strain on the memory controller, resulting in a significantly reduced max memory speed. In reality, it's only the rank count that affects max memory speed, at least on the 8+ layer AM5 boards like the Crosshair you're looking at. 4x1R configurations clock just as well as 2x2R configurations do, the only configuration where you run into issues is 4x2R. The same type of thing was observed on all DDR4 platforms, it's not something new. Not true, the CPU and motherboard should have ratios going all the way down to 800MT/s IIRC. They just have to stop somewhere when listing supported ratios and figured 4000 was as good a place as any.
I contacted Asus directly and they confirmed the supported minimum speed for AM5 boards ranges from 4000Mhz to 6400Mhz. They mentioned around a million transfers per second. However, if the motherboard reaches its maximum speed but doesn’t hit a lower limit, it should be acceptable. The main issue is the minimum speed of 4000Mhz versus the Ryzen 7000’s max of 3600Mhz. Thank you!
The ASUS representative you were speaking with was unfamiliar with the topic. The X670E Hero was operating at DDR5 3800 without any BCLK complications: I don’t have any clue where they obtained the 4000 figure, but it seems inaccurate.
It seems not ideal to use 128GB for a workstation right now. There aren’t any sellers listed for DDR5 ECC 64GB at the moment.
Only with Kingston and a few RAM modules can you fit four dimmers!
I just upgraded to B650E-F, Ryzen 9 7950x with 4x16gb Corsair ddr5 6000. Issue I'm having is the system will not post with all four cards only two, seems to be Straining to do so when it does. Which can take an hour to do so . My question is , should I return the cards for 2x32 and if I go with 4 cards which ones would work with no issues ? Also, system is on auto , no OC for anything . When I do use DOCP 1,2 or tweaker same issue applies.