DDR4 vs DDR5...

[Keith75]

My 5900X has DDR4 running at 3600MT CL18. I was looking at swapping it out with a new MB and CPU that are DDR5 running at 5600MT and CL46. How much more bandwidth will the DDR5 give me over the DDR4?

[Slottr]

AM4 doesn't support DDR5; you would need to completely change platform to utilize DDR5.

Sorry misread this.

 

Bandwidth will be limited to what PCIe 5 can supply, with a few other variables like what latency and speed the dimms are (if stable).

 

Realistically the bandwidth relatives aren't usually worth stressing about, all relative semantics

[Keith75]

4 minutes ago, Slottr said:

AM4 doesn't support DDR5; you would need to completely change platform to utilize DDR5.

Wouldn't replacing the MB and CPU let me run DDR5???

[Slottr]

1 minute ago, Keith75 said:

Wouldn't replacing the MB and CPU let me run DDR5???

My bad; misread it and updated the original reply

[KnoT]

5600MT at CL46 is extremely slow tho

[Tetras]

57.6 GB per second versus 89.6 (dual channel).

[GuiltySpark_]

1 hour ago, Keith75 said:

My 5900X has DDR4 running at 3600MT CL18. I was looking at swapping it out with a new MB and CPU that are DDR5 running at 5600MT and CL46. How much more bandwidth will the DDR5 give me over the DDR4?

Given that DDR5 is just "the standard" now for current platforms, I'm not quite sure if this question is being asked in a useful manner. Are you using this PC for something that specifically relies on raw memory bandwidth? 

 

I'm just trying to understand that if someone gives you a raw number that its going to answer the question you're actually looking for.

[freeagent]

He wants to know if the jump in bandwidth from DDR4 to DDR5 would be noticeable in his daily life, which I assume would be games.

 

At which point I would say... probably not as much as the IPC and clock speed gains that would blow you away first.

[GuiltySpark_]

10 minutes ago, freeagent said:

He wants to know if the jump in bandwidth from DDR4 to DDR5 would be noticeable in his daily life, which I assume would be games.

 

At which point I would say... probably not as much as the IPC and clock speed gains that would blow you away first.

Yeah, which Is why I asked that. It seemed like the wrong question. An XY problem, if you will. 

 

Quote

• User wants to do X.
• User doesn't know how to do X, but thinks they can fumble their way to a solution if they can just manage to do Y.
• User doesn't know how to do Y either.
• User asks for help with Y.
• Others try to help user with Y, but are confused because Y seems like a strange problem to want to solve.
• After much interaction and wasted time, it finally becomes clear that the user really wants help with X, and that Y wasn't even a suitable solution for X.

 

[kitnoman]

Well on AMD's side, upgrading to ddr5 ram, means upgrading to at least 7000 series. So there would definitely be significant improvement, unless you have a 5000 x3d variant. But the improvements would probably be less likely due to the ram.

The best way to compare improvement of ddr5 vs ddr4 is actually on intel, as 1700 motherboards either support ddr4 or ddr5. If you watch reviews, it will tell you that day to day usage would probably have insignificant improvement and very little on gaming. Personally, I think it probably because we are still in the early stages of ddr5 and current hardware and software can't fully maximized it's potential yet.

[Keith75]

It is a mix of gaming and work. The work doesn't need speedy RAM, but I have noticed that dropping RAM speed significantly affects gaming performance on my 5900x. I had tried running the RAM with XMP off and got lots of stutters and FPS drops, but with XMP on it is very smooth.

[otennicegg3]

It should depend on the applications that you still do.

 

If it's mostly gaming, I doubt that DDR5 would improve that much (even if it does have some benefits compared to DDR4) unless the PS6 or [insert Xbox Series X/S successor name] comes out and/or the last few games prior will start using DirectStorage or something. Like the above guy said, DDR5 is still too early for us to see its actual benefits. 

It may be different for stuff like running multiple VMs or running 3D rendering or any of those compute applications or something, but for gaming or most uses, the improvements are there but currently not that significant as it is of writing.

[GuiltySpark_]

2 minutes ago, Keith75 said:

It is a mix of gaming and work. The work doesn't need speedy RAM, but I have noticed that dropping RAM speed significantly affects gaming performance on my 5900x. I had tried running the RAM with XMP off and got lots of stutters and FPS drops, but with XMP on it is very smooth.

I think soley looking at RAM alone is not the right way to go about this. If you're moving to DDR5 that's just a byproduct of moving to a current platform so that's just one part of the overall performance package. A modern 7900x/9900x is a notable leap from a 5900x and the RAM is just along the for the ride to support it.

[Tetras]

21 hours ago, Keith75 said:

It is a mix of gaming and work. The work doesn't need speedy RAM, but I have noticed that dropping RAM speed significantly affects gaming performance on my 5900x. I had tried running the RAM with XMP off and got lots of stutters and FPS drops, but with XMP on it is very smooth.

This behaviour doesn't imply that DDR5 will be a huge upgrade.

 

Zen has always been a highly memory speed sensitive architecture (except for the X3D, that is not) and I'd expect FPS to tank at 2133 if you have a semi-decent graphics card.

 

Zen 4/5 is also impacted by slow DDR5 memory, but I'd say to a lesser degree than on AM4.