A Closer Look

The XPG SPECTRIX D45G DIMM modules are black with a matte finish. With a rectangular heatspreader covering the entire PCB, it is a neutral addition once installed. The top has an opaque plastic diffuser for the RGB LEDs wrapping around each end.


Laying the DIMMs on the side, the directional pattern emerges. The raised sections could be interpreted as a heatsink since these are just large fins. Heatspreader or heatsink? That is a question that can be left up for debate. Either way, it helps with passive thermal dissipation as these run at 1.5 V when the XMP profile is enabled.


The XPG logo in metallic colored lettering has been placed in the top-right corner on each side.


Below the XPG logo on one side of each DIMM module is the identification sticker listing the SKU, rated XMP operating frequency, corresponding voltage of 1.5 V, and timings.


The XPG SPECTRIX D45G weighs in at 63 grams on my scale, which is a bit hefty owing to the bulky heatspreader. Weight does not always dictate better thermal heat dissipation, but with the large diagonal fins, I think the weight isn't just for show, but actually a by-product of the thermal solution.

For Z-height, it is 45 mm rounding up with my calipers. The ideal height for the broadest compatibility with air coolers is 40 mm or below. I also suggest checking with the manufacturer of the air-cooler you intend to use. Often, all you need to do is raise the attached fan height; other times, the actual heatsink fin-stack is in the way, preventing the installation of the memory DIMMs altogether.


After taking the heatspreader off, we see that these are single-sided DIMMs with eight 1 GB ICs, which is as expected for an 8 GB kit. The thermal pad covers the entire length with some extra support via a strip of tape across the top to ensure these will never fall apart on their own.


Getting a closer look at the ICs, XPG does not disappoint. Using SK Hynix DJR, these are the same as in those DDR5-5000+ kits. While I do not want to spoil much from the overclocking section, I will say that these perform exceptionally well for being binned and sold as DDR4-4400. The primary timings do not scale as well compared to Samsung B-Die with voltage, but those B-Die ICs binned for 4400+ are becoming a rare sight as the tighter primary timings best suit DDR4-4000 kits or lower. Those who may be concerned by an XMP profile voltage of 1.5 should not worry, SK Hynix DJR can take a lot of voltage if you properly cool the ICs.

Thaiphoon Burner Readout

Thaiphoon reports the SPD correctly, listing SK Hynix DJR ICs and an 8-layer PCB. This XPG SPECTRIX D45G kit uses an XMP profile of DDR4-4400 19-26-26-46 at an operating voltage of 1.5. It also has a JEDEC SPD of 2666 MT/s, which is not ideal if you cannot enable the XMP profile. However, the JEDEC SPD is just for compatibility reasons and should not be used unless unavoidable.