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I bought 7600X CPU which AMD says will support up to 5200MHz memory.  I don't know what I'm doing and I bought 6400Mhz RAM that was on sale.

 

Are they incompatible? Is the RAM spec 'up-to'?  Meaning, it can support up-to 6400Mhz but when I plug it into my machine it will just run at 5200Mhz?

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The speed on the RAM sticks is the maximum speed that that RAM can run, given the correct conditions.

 

The speed on the CPU info page is the maximum stable speed that the CPU manufacturers can guarantee out of the box.

 

You can go to your BIOS settings and enable DOCP/EXPO by following the instruction in this YouTube Short: https://youtube.com/shorts/-J1jomNkn2s to get your RAM sticks run at higher speeds.

 

However, this is, as stated in the clip also, considered overclocking your RAM, so you might need to test around to find out the highest, most stable speed you can run. You need to know how to test your RAM stability and all that stuff. Normally, it'll be 6000Mhz for AM5 CPUs; it's the easiest overclocked speed for RAM. My RAM are running at this speed, too although they can go up to 6400Mhz, just like yours.

 

If you don't touch anything at all, your RAM sticks will run at a certain default speed which usually is not either the one on CPU page or obviously the one on RAM stickers. You can check your Task Manager to see which speed your RAM are running at.

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One aspect where Intel is still better than AMD is in the handling and stability of RAM, but I would think any modern DDR5 system could handle 6400Mhz (though 6000Mhz seems to be the sweet spot of performance-to-stability, with AMD, from what I've seen).  It depends on if your motherboard can handle it, and technically requires overclocking, but I would bet you can get it to run at 6400Mhz.  I'm guessing you haven't yet enabled AMD's EXPO, which should allow your RAM to operate at its full speed, but there is a SLIM chance it could cause minor system instabilities.  It probably won't, but if it does, you can tweak down the Mhz a little until your system stabilizes, or disable EXPO altogether.

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1 hour ago, DocGB said:

I bought 7600X CPU which AMD says will support up to 5200MHz memory.  I don't know what I'm doing and I bought 6400Mhz RAM that was on sale.

 

Are they incompatible? Is the RAM spec 'up-to'?  Meaning, it can support up-to 6400Mhz but when I plug it into my machine it will just run at 5200Mhz?

You bought the 7600X mere minutes after asking what build to get?

 

Maybe wait for people to actually respond before just buying things, especially if you don't know what you're doing.

 

6400 should run fine, but it's on the edge of the Infinity Fabric ratio cut off.  Try it and see, if you can't get it to run at 6400 or 6000, return it.  

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1 hour ago, DocGB said:

it can support up-to 6400Mhz but when I plug it into my machine it will just run at 5200Mhz?

I have an 8700G which is specced at 5200 but it's running fine at EXPO 6400,

after I flashed the MB BIOS to newest.

 

 

 

 

 

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The "speed" of RAM is only one of things to keep in mind when buying RAM you should also at least look at CL timings. 

 

For Ryzen gaming you would want something like 6000MT/s CL30 or 6400MT/s CL32 the lower CL value per given speed the better it's gonna be for gaming.

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3 hours ago, DocGB said:

I bought 7600X CPU which AMD says will support up to 5200MHz memory.  I don't know what I'm doing and I bought 6400Mhz RAM that was on sale.

 

Are they incompatible? Is the RAM spec 'up-to'?  Meaning, it can support up-to 6400Mhz but when I plug it into my machine it will just run at 5200Mhz?

what cl? the primaries except trcd are pretty useless especially cl but for buying xmp theyre important because they determine what ic you are going to get and the low cl bins like 6000c32 6400c32 etc. come with hynix a die which is pretty much the best ddr5 you can buy atm (9000+ capable) where the high cl c36 bins are usually some trash samsung or micron that gets crushed by the hynix not only in bone stock xmp but also when tuned, if you are not buying xmp then this doesnt matter and you just have to select ic via partnumber, for a die in 5600c46 bin its hmcg78agbua081n and its basically the same thing as the xmp sticks though this is more of an overclockers trick to get good rams for cheap

 

the manufacturer spec is what they guarantee as in if its worse than 5200 then its considered faulty and you can rma it otherwise the spec is completely useless and is not even a consideration when buying ram, most will do 6200 and some can do 6400 so youll probably just have to downclock to 6200 and be done with it

 

theres also 1/2 uclk that allows you to hit 7800-8400 depending on the chip and while 8000 1/2 uclk is faster than 6400 1:1 uclk its usually not worth the effort as its not that much faster and unless you are running a 1dpc like the b650m hdv or a newer b850/x870 which seem to be capable of atleast 8000 on most boards even the crappy 4dimmers itll be very annoying to dial in and stabilize

 

Spoiler

IMG_20240713_061216.thumb.jpg.1a2ac862ce78eb922789fcac5b87a8e7.jpgIMG_20230917_121324.thumb.jpg.0cd691d6383fecadbb927e75d85398c7.jpg

heres my example pushing both cpu and rams that are rated for 1333 to 2832c10 stable though dont expect 100% overclocks these days except for if you are using arrowlake and get a 4800c40 hynix a die stick (hmcg78aebua081n)

 

ram in particular has alot of nuance but all the other hardware is pretty straightforward as long as it isnt ram related though theres ofc still some nuance with them too like high end gen4 nvmes not being noticably faster than gen3 nvmes for non storage intensive use like gaming (youll see the diff if you do stuff like high res video editing) a and b tier psus not being different in reality cause the psus only job is to power the system (criteria = no random shutdowns or power related issues) if you like to use the tierlist which i personally dont, etc.

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