Question What frequency will my RAM run at without AMD EXPO ?

[runningw]

I am going to get an MSI MAG X870 TOMAHAWK WIFI mobo and an AMD Ryzen 9800X3D CPU.

When choosing RAM (16 G*2), I have some uncertainties. If I am not going to enable EXPO, what frequency will my RAM run at? If I understand correctly, the specifications of 9800x3d say it supports 5600 MHz DDR5 RAM at maximum, right? Since the motherboard supports a range of frequencies, so if I buy RAM with 6400 MHz, will they run at 5600 MHz or other frequencies? Thanks!

 

[COLGeek]

I would expect that, worst case, is that the memory would run at the default DDR5 4800Mhz.

Lots of info available searching these terms: default ddr5 speed

Some layman, some very technical.

 

[runningw]

I would expect that, worst case, is that the memory would run at the default DDR5 4800Mhz.

Lots of info available searching these terms: default ddr5 speed

Some layman, some very technical.

Thanks! So if I want to achieve 5600 MHz, I have to enable XMP or EXPO, right? But shouldn't XMP or EXPO brings the frequencies even higher?

 

[COLGeek]

EXPO (AMD's equivalent to XMP) can set the memory at a higher rated speed, yes. If the memory you choose has the profile programmed into it.

Please link the specific memory you are asking about.

 

[runningw]

EXPO (AMD's equivalent to XMP) can set the memory at a higher rated speed, yes. If the memory you choose has the profile programmed into it.

Please link the specific memory you are asking about.

I want to buy Corsair vengeance 16 GB*2, 6400 MT/s, but for some reason, I do not have access to the EXPO version, only the XMP version. If without EXPO enabled, RAM runs at 4800 MT/s; with EXPO enabled, RAM runs at >5600 MT/s, then what is the point of CPU maximal supported frequencies only at 5600 MT/s?

 

[COLGeek]

I want to buy Corsair vengeance 16 GB*2, 6400 MT/s, but for some reason, I do not have access to the EXPO version, only the XMP version. If without EXPO enabled, RAM runs at 4800 MT/s; with EXPO enabled, RAM runs at >5600 MT/s, then what is the point of CPU maximal supported frequencies only at 5600 MT/s?

That memory will work perfectly fine in an Intel based system. You may be able to manually tweak it for higher speeds in an AMD system.

Regardless, from a user's normal operation perspective, you'll see zero difference in speeds from the desktop. If benchmarking, yes. you would see some relatively small difference. Same for perceived FPS differences in gaming.

 

[drivinfast247]

Thanks! So if I want to achieve 5600 MHz, I have to enable XMP or EXPO, right? But shouldn't XMP or EXPO brings the frequencies even higher?

It would bring it up the the listed EXPO speed of the RAM.

 

[Bob.B]

I want to buy Corsair vengeance 16 GB*2, 6400 MT/s, but for some reason, I do not have access to the EXPO version, only the XMP version. If without EXPO enabled, RAM runs at 4800 MT/s; with EXPO enabled, RAM runs at >5600 MT/s, then what is the point of CPU maximal supported frequencies only at 5600 MT/s?

If you fit intel ram to an amd mobo that does not support that ram your on your own as to if you will ever get it to function proper.

 

[CountMike]

At lower speeds, up to 6400MHz, Ryzen will work fine even using XMP instead of EXPO in Bios and memory. That is at same tame most economical speed for memory to run at full performance in 1:1:1 ratio with IMC.

 

[steveb1976]

corsair vengence ram is the most common ,and supported across all platforms..
if you have them istalled and its only giving you "XMP" option use it. it will be the same as using "EXPO",.
all ddr5 will run at a base core speed of "4800 mt's".its a speed they can guarantee, and anything above is classed as "overclocking" unless you buy ram that specifies its core speed in higher..
if you buy the "6400mt's" varient. it means that they were tested and can run at that speed ... but some can boost higher.

amd says 5600 maximum on their sites.. but all cpus will take higher.. its just amd covering themselves.. as they cant 100% guarantee what each cpu/motherboard, will be able to reach.. so they actually state higher speeds are achievable but its hardware dependent...

.im currently running 2x16gb ddr5 6000mt's with ryzen 5 7500f... no issues.