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X8 DDR5 vs X16 DDR5 Memory


KING19
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The results are pretty shocking.

 

Current Laptop:

Lenovo Legion 5: AMD Ryzen 7 4800H 2.8Ghz (Boost: 4.2Ghz), 6GB Nvidia Geforce GTX 1660Ti GDDR6 Memory, 15.6" FHD (1920 x 1080) 144Hz IPS display, 16GB 3200MHz DDR4 memory, 512GB M.2 NVMe PCIe SSD, 1 TB Teamgroup MP34 M.2 NVMe PCIe SSD, Windows 10 Home 21H2

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What's the summary for those of us conserving out bandwidth by preferring text/images to video?

 

My guess is it's that in some use cases DDR4 is as good as DDR5.  MSI did a study on this: https://www.msi.com/blog/a-closer-look-at-ddr5-benchmarks-with-intels-Alder-lake-cpus  The tl;dr is that at the same capacities, top-of-the-line DDR4 can match or exceed most DDR5.  Two relevant charts:

 

DDR5

 

DDR5

 

So that 3600 C15 vs 4800 C40 is pretty close for write speeds at the same capacity, and 4800 C20 DDR4 wins over 4800 C40 DDR5.  Presumably DDR4 3200/3600 is cheaper than DDR5, although whether 4800 C20 DDR4 is going to save you any money over DDR5, I'm not so sure...

 

What I don't know the answer to yet is why doubling the capacity helps so much with DDR5.  It should be dual-channel in all cases in the second chart.  But it seems to be relevant.

 

Now if the video is looking at game benchmarks... I wouldn't be surprised if the difference is negligible.  Unless they're running on integrated graphics, faster RAM usually doesn't have major impacts on game frame rates.  And DDR5's weakness at this early stage of its lifetime is its latency - the DDR3 in my desktop (9-9-9-24 1600) will beat any of the DDR5 that MSI was able to test in latency, and DDR4 almost always wins too.  So for a game that is more dependent on latency than bandwidth, DDR5 might do worse.  Latency should improve as DDR5 matures... but it's the tradeoff of jumping on board early, along with the higher price.

 

IIRC, workloads like compression and encoding are more likely to benefit from DDR5's bandwidth improvements.

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Desktop: Core i5 2500k "Sandy Bridge" | RX 480 8 GB | 32 GB DDR3 | 850 Evo + HDDs | Seasonic Prime Titanium 650W | 8.1 Pro

Laptop: MSI Alpha 15 | Ryzen 5800H | Radeon 6600M | 16 GB DDR4 | 512 GB SSD | 10 Home

Laptop history: MSI GL63 (2018) | HP EliteBook 8740w (acq. 2014) | Dell Inspiron 1520 (2007)

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DDR5 is still new so its going to take more time for it to mature, Even looking at the benchmarks its still not worth the price for it right now imo especially with real world testing. The only good thing about DDR5 is that it caused DDR4 RAM prices to drop!.

 

 

Current Laptop:

Lenovo Legion 5: AMD Ryzen 7 4800H 2.8Ghz (Boost: 4.2Ghz), 6GB Nvidia Geforce GTX 1660Ti GDDR6 Memory, 15.6" FHD (1920 x 1080) 144Hz IPS display, 16GB 3200MHz DDR4 memory, 512GB M.2 NVMe PCIe SSD, 1 TB Teamgroup MP34 M.2 NVMe PCIe SSD, Windows 10 Home 21H2

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