RAM compatibility with Asus b350f

Chandler_8 · Aug 1, 2017

I am new to the PC community and i am worried my ram and motherboard are not compatible. Can someone tell me if they will work together. The manual says it dosent accept anything greater than DDR4 2666 but it also say the max is DDR4 3200 Hz OC. Do i have to OC for this to work? Sorry for the dumb questions but im new to this.

MOBO link: https://www.asus.com/Motherboards/ROG-STRIX-B350-F-GAMING/

RAM Link: https://www.amazon.com/dp/B0123ZBPDA/ref=twister_B01M33CGCY?_encoding=UTF8&psc=1 (Corsair Vengeance LPX 8GB (2x4GB) DDR4 DRAM 3000MHz (PC4-24000) C15 Memory Kit - Black)

Zerk2012 · Aug 1, 2017

It should work but default to 2400 or 2666 and need to be set in BIOS to the advertised, speed, timings, and voltage.

raisonjohn · Aug 1, 2017

The model number of the Corsair RAM you linked is CMK8GX4M2B3000C15 (http://www.corsair.com/en-gb/vengeance-lpx-8gb-2x4gb-ddr4-dram-3000mhz-c15-memory-kit-black-cmk8gx4m2b3000c15). It's a max. 3000MHz RAM speed which you will have to O.C. to achieve such speeds (else, will default to stock 2133MHz). It can't go 3200MHz.

Your Asus B350-F Gaming supports such specific RAM kit as shown in your motherboard's QVL (Qualified Vendors List), dated 2017/06/07, in Page 9, Line 23 here: http://dlcdnet.asus.com/pub/ASUS/mb/SocketAM4/STRIX_B350-F_GAMING/ROG_STRIX_B350-F_GAMING_SummitCPUDDR4_DRAM_QVL20170520.pdf?_ga=2.36502057.845906361.1501414390-1428616915.1495995095

On the matter of the DDR4 2666 "limit", your motherboard's User Manual (http://dlcdnet.asus.com/pub/ASUS/mb/SocketAM4/STRIX_B350-F_GAMING/E13031_ROG_STRIX_B350-F_GAMING_UM_V2_web_20170606.pdf?_ga=2.237756041.845906361.1501414390-1428616915.1495995095), in Page vii, states:

"AMD Ryzen™ Processors
4 x DIMM, Max. 64GB, DDR4 3200(O.C.)/2933(O.C.)/2666/2400/2133 MHz ECC and Non-ECC, Un-buffered Memory*

Dual Channel Memory Architecture
* Due to AMD Ryzen™ Processor limitation, More than DDR4-2666 is supported by one DIMM per channel only
* Refer to www.asus.com for the latest Memory QVL (Qualified Vendors List)."

The above * (notes) on the User Manual pertains to supporting up to speeds of 2666MHz only when all 4 RAM slots are populated (i.e., 2 RAMs per channel), depending on the RAM chips' rank design. Consequently, if only 2 RAM slots are populated (i.e., 1 RAM per channel), the CPU/MB can support higher speeds, also depending on the RAM chips' rank design.

Note that the data above were limitations of the Ryzen on memory support prior to the May 2017 microcode update. During that time, 3000MHz and 3400MHz RAM speeds were not supported (as you can see in the User Manual's lack of "3000(O.C)" in the list)
After the microcode update, a lot of RAM kits have been tested to support such speeds, including your RAM kit, based on Asus' updated QVL.

But Ryzen is picky when it comes to RAM compatibility, so, on the matter of using all 4 RAM slots at 3000MHz speeds, I think (might be wrong unless there are some new updates) it will still default at ~2133MHz or a bit higher (depending on the Ryzen CPU chip's capabilities).

Hence, most recommended going for a 16GB (2 x 8GB) RAM kit right away (instead of 2 x 4GB and adding another 2 x 4GB in the future) so you can achieve 16GB capacity using only 2 RAMs at high speeds.

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