PSA: Corsair LPX and AMD

[Caring1]

Which one is which?
Also, do we know if the two modules uses the same brand of DRAM chips?

Edited to make it clearer.
I don't know if both use the same dram chips.

 

[TheLostSwede]

Edited to make it clearer.
I don't know if both use the same dram chips.

Fair enough, at least the Z spec look much better overall.
I presume you haven't gotten them yet?

 

[Caring1]

Fair enough, at least the Z spec look much better overall.
I presume you haven't gotten them yet?

Pick it up tomorrow

 

[TheLostSwede]

Pick it up tomorrow

It'll be interesting to see what you get.

 

[dandaman622]

Yeah you have to be careful which ones you get. On amazon there is a main page where you can go through a drop down list, and some of them will say Ryzen.

https://www.amazon.com/Corsair-Vengeance-3200MHz-Desktop-Memory/dp/B0143UM4TC/ref=sr_1_2?dchild=1&keywords=corsair+vengeance+lpx&qid=1607258297&sr=8-2

Where it says style you have to make sure you choose specifically. Someone else ordered some for me and they just ordered without changing, so I got the CMK16GX4M2B3200C16. The XMP profile would crash my computer in CS GO after 5 to 10 minutes of playing. I used it at 3000mhz for a while, until I started learning a little bit and messing with timings and voltage. I eventually got it to work stable at 1.5V, but I read that raising the SOC might have helped too. I didn't get a chance to try that because I got a kit of Ballistix RGB 3200 and it's been great. Stable and easily overclocked.

Sorry for the long paragraph. Just be careful if you do decide to go with the Corsair Vengeance to pay attention to which ones you are getting like OP said.

 

[bimmerdriver]

Yeah you have to be careful which ones you get. On amazon there is a main page where you can go through a drop down list, and some of them will say Ryzen.

https://www.amazon.com/Corsair-Vengeance-3200MHz-Desktop-Memory/dp/B0143UM4TC/ref=sr_1_2?dchild=1&keywords=corsair+vengeance+lpx&qid=1607258297&sr=8-2

Where it says style you have to make sure you choose specifically. Someone else ordered some for me and they just ordered without changing, so I got the CMK16GX4M2B3200C16. The XMP profile would crash my computer in CS GO after 5 to 10 minutes of playing. I used it at 3000mhz for a while, until I started learning a little bit and messing with timings and voltage. I eventually got it to work stable at 1.5V, but I read that raising the SOC might have helped too. I didn't get a chance to try that because I got a kit of Ballistix RGB 3200 and it's been great. Stable and easily overclocked.

Sorry for the long paragraph. Just be careful if you do decide to go with the Corsair Vengeance to pay attention to which ones you are getting like OP said.

As I posted above, I purchased CMK32GX4M2B3200C16 and found that it will only post with XMP enabled @1.35v when the system is cold. I contacted Corsair and they told me that kit is incompatible with Ryzen. Here is Corsair's compatibility list: AMD RYZEN 2000 & 3000 SERIES Memory Compatibility List. You can see that the compatible kits have Z in the SKU. I wish I would have looked for this information before I ordered the DRAM based on Gigabyte's QVL, which is basically useless.

 

[Caring1]

It'll be interesting to see what you get.

Turned out to have Nanya Dram chips and they are A die.
Not that it matters as he's one of those users that just wants it to run and doesn't tinker with the computer.

 

[TheLostSwede]

Turned out to have Nanya Dram chips and they are A die.
Not that it matters as he's one of those users that just wants it to run and doesn't tinker with the computer.

That's highly unusual. I was expecting something like Hynix.
Again, this is so confusing with Corsair, as you never know what you get.

 

[Shou Miko]

My Geil Dragon RAM isn't AMD Ryzen certifiled but they work only Asus with my current B550 board had a weird A.M.P. where it wants to run them at a 4000MHz well the Hynix kit is 3000MHz and the Samsung B-Die kit is 4400MHz if I remember correctly so there is no change that the Hynix kit will do 1000MHz OC with the same timings as the Samsung B-Die kit Asus come on I know you can do better then this

Thank you @TheLostSwede for this, even I properly can't remember it in the future but I can try

 

[nasky]

Weird mine are working fine with ryzen 3x on x570 although not marked as compatible : CMK32GX4M2E3200C16

They even overclock @3600C16 and honestly I just bought them because they were the cheapest I guess I was lucky

 

[TheLostSwede]

Weird mine are working fine with ryzen 3x on x570 although not marked as compatible : CMK32GX4M2E3200C16

They even overclock @3600C16 and honestly I just bought them because they were the cheapest I guess I was lucky

I think you misunderstand the point of this thread. The ones with a Z in the product name are supposed to be 100% compatible and that's why I posed the info here.
Other LPX modules are a bit hit and miss, doesn't mean that some of them won't work, but some of them are also known to not work well with Ryzen CPUs.
You clearly got one of the good kits, but myself and several others have had kits that don't work anywhere near their rated speeds.
Friend of mine got some with a B in the model name and although they work and are based on Samsung B-dies, they suffer from very high latency and that's with a Ryzen 7 5800X. The tRFC can't go lower than somewhere in the 500 range, which is terrible for B-dies.

 

[nasky]

I think you misunderstand the point of this thread. The ones with a Z in the product name are supposed to be 100% compatible and that's why I posed the info here.
Other LPX modules are a bit hit and miss, doesn't mean that some of them won't work, but some of them are also known to not work well with Ryzen CPUs.
You clearly got one of the good kits, but myself and several others have had kits that don't work anywhere near their rated speeds.
Friend of mine got some with a B in the model name and although they work and are based on Samsung B-dies, they suffer from very high latency and that's with a Ryzen 7 5800X. The tRFC can't go lower than somewhere in the 500 range, which is terrible for B-dies.

yeah my tRFC too cant go below 600 but I ont think it makes that big of a difference

 

[bimmerdriver]

I think you misunderstand the point of this thread. The ones with a Z in the product name are supposed to be 100% compatible and that's why I posed the info here.
Other LPX modules are a bit hit and miss, doesn't mean that some of them won't work, but some of them are also known to not work well with Ryzen CPUs.
You clearly got one of the good kits, but myself and several others have had kits that don't work anywhere near their rated speeds.
Friend of mine got some with a B in the model name and although they work and are based on Samsung B-dies, they suffer from very high latency and that's with a Ryzen 7 5800X. The tRFC can't go lower than somewhere in the 500 range, which is terrible for B-dies.

Here is the reply from Corsair when I asked them about this memory (without Z in the part number):

I apologize but that kit of memory is not compatible with any Ryzen based platform as you can see in the technical specifications listed below, and as such we do not guarantee its ability to hit the rated XMP profile.

 

[TheLostSwede]

yeah my tRFC too cant go below 600 but I ont think it makes that big of a difference

On Ryzen, tRFC has a huge impact on memory latency.

Here is the reply from Corsair when I asked them about this memory (without Z in the part number):

I apologize but that kit of memory is not compatible with any Ryzen based platform as you can see in the technical specifications listed below, and as such we do not guarantee its ability to hit the rated XMP profile.

Not compatible and then not guaranteed... That's a nice answer.
Also, XMP is never guaranteed on Ryzen and is often a poor option versus setting the RAM up manually.

 

[thesmokingman]

Pro tip: AVOID CORSAIR RAM LIKE THE PLAGUE.

 

[INSTG8R]

Pro tip: AVOID CORSAIR RAM LIKE THE PLAGUE.

And yet...my RAM made the list?

Best RAM for Ryzen 5 5600X in 2023 - TechEdged

AMD Ryzen 5 5600X is one of the best processor you can have and we are reviewing the best RAM for Ryzen 5 5600X to get the max out of it.

techedged.com

 

[Zach_01]

On Ryzen, tRFC has a huge impact on memory latency.

Yes it does!

Pro tip: AVOID CORSAIR RAM LIKE THE PLAGUE.

Well, that depends

LPX, Z series...

 

[mtcn77]

The XMP profile would crash my comput

found that it will only post with XMP enabled @1.35v when the system is cold. I contacted Corsair and they told me that kit is incompatible with Ryzen.

My Geil Dragon RAM isn't AMD Ryzen certifiled but they work only Asus with my current B550 board had a weird A.M.P.

XMP is never guaranteed on Ryzen and is often a poor option versus setting the RAM up manually.

XMP is Intel, AMP is AMD. I think AMD users deserve their own product placement in the memory kits'es marketing stuff. Just place an 'AMP' badge somewhere around the front of the product display and make sure to mention it means 'good for AMD'. They had the Flare X Samsung B kits that were top notch performers for both of the cpu makers that they sold out - every last kit was a B die collector's item.
They have sorted the motherboard manufacturers, they owe it to their customers to do the same with memory manufacturers.

 

[TheoneandonlyMrK]

I have been very harsh on Lpx in the past but I used two Ryzen stamped kits this week and I am very happy to say that the Ryzen marked ones work well at XMP.

 

[Shou Miko]

XMP is Intel, AMP is AMD. I think AMD users deserve their own product placement in the memory kits'es marketing stuff. Just place an 'AMP' badge somewhere around the front of the product display and make sure to mention it means 'good for AMD'. They had the Flare X Samsung B kits that were top notch performers for both of the cpu makers that they sold out - every last kit was a B die collector's item.
They have sorted the motherboard manufacturers, they owe it to their customers to do the same with memory manufacturers.

X.M.P. is also listed at A.M.P. in a lot of AMD bios' but if you don't say X.M.P. a lot of non-tech people looks confused. I know the term just don't use it much

 

[INSTG8R]

X.M.P. is also listed at A.M.P. in a lot of AMD bios' but if you don't say X.M.P. a lot of non-tech people looks confused. I know the term just don't use it much

It’s certainly called XMP in my Gagabyte BIOS

 

[NoJuan999]

And Asus Uses DOCP instead of XMP.

 

[mtcn77]

And Asus Uses DOCP instead of XMP.
View attachment 180617

Well, A.M.P-X.M.P variation occurs at the validation step of memory production, Asus can call it what it wants. Not to be picky about names, but for direct validation on AMD test benches before sale.