AMD EXPO ULL shows middling performance gains in initial tests despite eye-watering price increase — first benchmarks show up to a 4% improvement with DDR5-6000 CL36

After announcing it last month, the first AMD EXPO Ultra Low Latency (ULL) memory kits are finally available; and with up to an 80% jump over already inflated RAM prices in tow. HardwareLuxx was able to snag a kit of G.Skill's new Trident Z5 NeoX RGB memory to see how ULL performs, and the results don't quite justify the extra cost. At most, the publication found just a 4% improvement compared to non-ULL kits.

That aligns with AMD's original claims about ULL. When the company announced the initiative last month, it also cited a 4% improvement over standard EXPO. However, AMD claims that ULL offers a 4% improvement on average, while HardwareLuxx only found that large of an improvement in a single game: F1 25. AMD reached out following publication and noted that its 4% average was across a wide variety of titles, and that there are inconsistences between each game, with some titles showing little to no benefit.

HardwareLuxx tested a 2 x 16GB kit at 6,000 MT/s with primary timings at 36-36-36-76. Compared to standard EXPO/XMP DIMMs, a lot of the optimization with ULL DIMMs comes from tuning the subtimings. The primary timings are largely the same as what you'll find on a standard EXPO kit, short of tWR (write recovery), which is lower on the EXPO ULL kit. Better binning of the memory ICs allows for more aggressive subtiming optimization, as HardwareLuxx notes, rather than relying on timings primarily concerned with stability.

In games, the ULL kit showed clear performance improvements, no matter how minor they were. In F1 25, the ULL kit outclassed a DDR5-6000 CL26-36-36-96 kit by 4.2%, and beat out JEDEC standards at 5600 MT/s by nearly 14%. Similarly, in Cyberpunk 2077, the ULL kit was around 3.7% faster than the standard EXPO kit, and 12.7% faster than JEDEC standards. The outlet also tested Arc Raiders, Baldur's Gate 3, and Counter-Strike 2; however, the ULL kit didn't offer a meaningful performance improvement in any of these titles.

The outlet also tested 7-Zip, though with only minor differences between ULL and non-ULL memory. The most interesting results are from the microbenchmarks available in AIDA64, which HardwareLuxx also ran. ULL showed largely similar copy and read throughput, but write throughput was 9.4% higher with ULL compared to stock EXPO.

Although there's a performance benefit, it's minor, and HardwareLuxx notes that "manual tuning still allows for the maximum possible optimization."

The particular kit that HardwareLuxx tested doesn't have the extreme ULL price increases we've seen elsewhere. It's currently available for sale for $530, which is only $20 more than a kit of G.Skill's Trident Z5 Neo RGB memory at DDR5-6000 CL36. It's actually gone down in price (it was originally listed at $550), while kits with more aggressive timings have increased in price.

The NeoX DDR5-6000 CL26 kit, for example, has jumped up $50 to $1,150 — yes, that's for a 2 x 16 GB kit still — while the CL28 kit has jumped up to $1,030 (a $30 price increase). Two weeks ago, we saw non-ULL kits selling at $560 and $700 for CL28 and CL26, respectively, creating a large delta in price between ULL and non-ULL kits. Now, those kits are selling for $700 and $900, respectively.

The introduction of ULL couldn't have come at a worse time, as the ongoing DRAM shortage continues to raise the cost of building a PC around the world. Adding a premium on top of those already inflated prices is tough to justify, even if that premium is modest — especially for mainstream CL36 and CL30 kits, the "ULL tax" is essentially null. The good news is that you can largely achieve what ULL offers on your own, at least given that you have the patience to sit through tuning your memory for single-digit gains.

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