The time of 32 Gbit DDR5 ICs is here, on conventional desktop UDIMMs. With Crucial’s new 64 GB modules, we are looking at the first memory modules with 32 Gbit or 4 GB capacity that are freely available on the market. Accordingly, this results in 32 GB single-rank or 64 GB dual-rank modules, the latter of which we are testing today in a kit of 2.
The result of this is more capacity, twice as much as the 16 Gbit ICs of the first DDR5 hour and another 50% more than the 24 Gbit ICs from the recent past. Apart from the capacity, nothing changes for the time being. Most (recommendable) chips will have a x8 bit width, so that with 8 of them you get the 64 bits of a DDR5 module. This means that the rule remains the same: 8 ICs per module (single-sided) = single-rank, 16 ICs per module (double-sided) = dual-rank.
Specifications and unboxing
However, the product names and numbers are interesting, as the capacity alone no longer tells you whether a 32 GB module has 2 ranks of 16 Gbit ICs, as we used to know, or whether only 1 rank with 32 Gbit ICs is used. Many RAM kit manufacturers do not (yet) have a number or identifier in their product numbers that could indicate this. Unfortunately, this is likely to cause confusion for performance-interested buyers and thus also the need for transparent tests of DDR5 kits.
Which brings us to today’s test subject, which directly answers these questions in its specifications on the manufacturer’s website. CT2K64G56C46U5 is the product number of the kit. In addition, the number without “2K” is printed on the packaging sticker for the individual modules. If you search for this in Google, you will be taken directly to Crucial, where the specifications including the “die density”, i.e. the capacity of an individual IC, are presented transparently. Very exemplary and the first praise before the test even really starts. The specs could only be better if the complete EXPO/XMP timings were listed.
The Crucial kit with 2x 64 GB modules and thus 128 GB total capacity comes with a conservative 5600 Mbps, CL46 and 1.1 V voltage a la JEDEC, but also supports these as Intel XMP and AMD EXPO. Pointless? Not quite, because not all mainboard or CPU generations immediately recognize the faster 5600 JEDEC profile on the first boot and, in the worst case, start with only DDR5-3600. Thanks to the profiles, the specification can be reloaded if necessary, provided the platform also supports it stably, but more on that in a moment.
The modules are available as here in the “Classic” version without a heat sink, but a “Pro” version with a heat sink also made it onto the market a few weeks later. We have already looked at the “Pro” and “Pro Overclocking” series from Crucial, with 16 Gbit Rev. D memory modules, but the design appears to be identical:
Without the heat sink, we still have a direct view of the ICs, PMIC and the sticker with the individual product number of the modules. Thanks to the transparent carrier frame, this is even possible inside the packaging in the store.
CT64G56C46U5.M16B1 is the number of the individual modules, which is relatively trivial to decode:
- CT: Crucial
- 64G: 64 GB capacity
- 56: 5600 Mbps
- C46: tCL Timing 46
- U5: DDR5 UDIMM
- M: Micron
- 16: Number of ICs (thanks, Kif_Kroker1729)
- B: Die revision = Rev. B
- 1: Binning Level
Crucial clearly states 64 GB capacity here, consisting of 16 ICs, which in turn clearly indicates a capacity of 32 Gbit or 4 GB per IC.
In addition to the usual identifiers for security certifications, we also find the production week 2516 (CW16 2025) on the sticker, as well as a QR code with the serial number, the last 8 characters of which are also printed below in plain text.
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