Question Why PC3-14900 RAM has the same performance as PC3-8500 RAM on my PC ?

[BigJapko]

Hi,
i bought some PC3-14900 RAM for my HP Z420 v2 Workstation, hoping it would be faster than my old PC3-8500 RAM, but sadly the speeds are nearly the same.

Passmark benchmarks confirm that:
www.memorybenchmark.net/ram.php?ram=SK+Hynix+HMT41GR7AFR4C-RD+8GB
www.memorybenchmark.net/ram.php?ram=Samsung+M393B2K70CM0-YF8+16GB

How is that possible ?
Thank you.

 

[rgd1101]

is the HP running the ram max speed?

 

[BigJapko]

HP Z420's max memory speed is 1600 MHz. CPUZ says PC3-14900 runs at some 900MHz and PC3-8500 at 500MHz.
BIOS has no settings for RAM

 

[rgd1101]

that doesn't sound right

DDR3 1600 PC3-12800 – Memory Best Practices | Kingston Technology- Kingston Technology

New chipsets and processors from AMD and Intel now support memory operating at 1600MT/s. DDR3 1600 memory has a module classification of PC3-12800.

www.kingston.com

what cpu is on that hp?

 

[BigJapko]

It is Xeon E5-1650 v2. Motherboard is working on 4 memory channels and has 8 sockets.
Passmark Memtest86, VOVSOFT RAM Benchmark, GFX Memory Speed Benchmark show near the same speeds.
Only OCCT Benchmark can appreciate PC3-14900 modules: 520 vs 320 (some index) and 27r/22w vs 16r/14w (GiB/s).
I also don't know why the difference in benchmarking tools.