Viper Elite II DDR4 4000MHz Kit Review

Previously we mentioned that we believe the Hynix Modules on the Viper Elite II to be CJR series and that is because no matter what we tried, we could not get the system to POST with the Elite II modules clocked higher than the XMP 4000 MHz. more voltage and heavily relaxed timings still would give a failure to POST. 4000 MHz seems to be a common ceiling for CJR dies. On the flip side, they often can operate with tight timings, so we’ll try cranking those down instead.

Moving down to CAS-19 is super easy.

Zero settings need to change for CAS-18.

CAS-17 requires bumping voltage slightly to 1.425V. C16 refuses to post without voltage higher than we are comfortable with though.

Dialing down the rest of the primary timings a little at a time lands us at a final 17-21-21-28 at 4000MHz effective. We gain quite a bit of read bandwidth, a bit of write bandwidth, and latency plummets from 51.2ns to 47.1ns.

Without any additional speed, just tighter timings, our Super-Pi 32M time falls from an XMP time of 6:58.479 to 6:56.109, shaving almost two and a half seconds off.