Today we are examining a couple of DDR4 4GHz kits from Essencore KLEVV – which is effectively the retail arm of memory giant SK Hynix. The Bolt XR is a commodity DDR4 kit with low profile heatspreader design that could be ideal for users with large CPU coolers. The Cras XR RGB is, as the name suggests, equipped with an RGB lightbar atop the heatspreader to add colourful flair to the modules.