IGPU performance with DDR5 ram

[Tatonoot]

Friends wants to get a laptop with an IGPU one day, preferrably a Ryzen 7 one for them cores. Though, we are unsure if he should wait for DDR 5 or not, as it is on our understanding that the performance is dependent on ram speed. After all, the m1 gpu is inbetween a gtx 1050 ti and a 1650 with an LPDDR4X-4266, so igpus would be much better with DDR5, right? Is the logic that he is going with.

 

Would DDR 5 make the performance significantly better? Or should he just go ahead and get one to save him the trouble of waiting.

[flibberdipper]

While yes, iGPUs stand a good chance of being able to get a lot less bandwidth-constrained with DDR5 and therefore faster, it's really not going to be enough of a boost for your friend to warrant waiting.

[WereCat]

The early DDR5 seems that it will be much slower because of the timings.

Yes, the early JEDEC 4800MHz looks cool but they mentioned 40-40-40 timings which is absolutely terrible.

 

Right now you can run DDR4 4800MHz at 18-24-24 for example

https://www.corsair.com/us/en/Categories/Products/Memory/DOMINATOR-PLATINUM-RGB/p/CMT16GX4M2K4800C18#tab-tech-specs

 

So until the DDR5 matures, DDR4 will simply be just better. That's always the case with new vs old DRAM within the 1st to 2nd year from launch.

[TechTree101]

12 hours ago, WereCat said:

The early DDR5 seems that it will be much slower because of the timings.

Yes, the early JEDEC 4800MHz looks cool but they mentioned 40-40-40 timings which is absolutely terrible.

 

Right now you can run DDR4 4800MHz at 18-24-24 for example

https://www.corsair.com/us/en/Categories/Products/Memory/DOMINATOR-PLATINUM-RGB/p/CMT16GX4M2K4800C18#tab-tech-specs

 

So until the DDR5 matures, DDR4 will simply be just better. That's always the case with new vs old DRAM within the 1st to 2nd year from launch.

Comparing "CAS latency" between entire new DDR versions is not a good idea, they are incomparable.

 

You have to look at other areas like clock rates, cycle times, clock timings (not the same thing as CAS), and efficiencies elsewhere on the chips and interconnects, not just the timings.

 

What you CAN say is asking the question, "will timings get noticeable better than the standard 40-40-40" and then you can make some valued judgements on performance differences.

 

So, in short, no, DDR5 is not going to be slower than the same standard DDR4 , unless of course you compare the lowest DDR5 with the highest DDR4, but that's not really a fair comparison (for the obvious reason but also because most can't afford or wouldn't want to get the 'fastest' DDR4 for other performance reasons, such as higher CAS latencies (again, only comparable if using the same DDR version).

 

[WereCat]

1 hour ago, TechTree101 said:

Comparing "CAS latency" between entire new DDR versions is not a good idea, they are incomparable.

 

You have to look at other areas like clock rates, cycle times, clock timings (not the same thing as CAS), and efficiencies elsewhere on the chips and interconnects, not just the timings.

 

What you CAN say is asking the question, "will timings get noticeable better than the standard 40-40-40" and then you can make some valued judgements on performance differences.

 

So, in short, no, DDR5 is not going to be slower than the same standard DDR4 , unless of course you compare the lowest DDR5 with the highest DDR4, but that's not really a fair comparison (for the obvious reason but also because most can't afford or wouldn't want to get the 'fastest' DDR4 for other performance reasons, such as higher CAS latencies (again, only comparable if using the same DDR version).

 

Yes, that's why I specifically stated an early DDR5 vs older gen.

Like was the case with DDR4 vs DDR3 and DDR3 vs DDR2, etc...

 

The early new gen DDR is almost always significantly slower than the previous gen and yes, I am comparing the high end old version vs the new version.

But we still don't know the price of DDR5, it may be as expensive as the high end DDR4 is right now, we don't know.

 

There will definitely a good benefits to DDR5 like the lower power usage with lower power requirements, built in ECC, etc... Also the CPUs that will run DDR5 will be faster certainly.

 

I was simply saying if you could put a DDR5 right now together with a CPU that exist now the speeds and CAS latency of the early DDR5 would simply make it worse as current DDR4.

But we can't compare it like that for real so it was all just a hypothesis.

 

To answer OPs question is to say that it's a bad question.

If you wait for new DDR5, you are waiting for new CPUs as well which will be better than the old ones (most likely). So whether the new DDR5 is faster or slower does not matter as the new CPUs will still provide a better performance. Assuming they also improve the iGPU it will be of benefit as well even if the theoretical DDR performance stays the same.

Obviously, higher memory bandwidth seems to help iGPUs a lot and DDR5 will in time have much higher bandwidth than a DDR4, most likely not at launch though.