Low performance with DDR3 2400 MHz TridentX

[Kamil_19]

Hi, I have problem with low RAM write speed on AIDA64 and SiSoft Sandra RAM benchmarks.
My platform is:
[email protected] GHz, cache 4.2 GHz
Asrock Z87 Extreme3
2x8 GB G. Skill TridentX 2400 CL10 (double sided)
Windows 10 Pro
Ram is in double channel configuration with XMP profile active. Before TridentX I had Kingston 1333 CL9 sticks. After upgrade I see massive boost in WinRAR benchmark (~4900 kb/s to almost 7200 kb/s), boost in fps in games, faster rendering and video compression. RAM read tests give me almost 36000 MB/s, but RAM write tests give me only ~21500 MB/s. Shouldn't it be much higher?
I've tried CPU stock clock setting, manual timings configuration, changing RAM 1T/2T and nothing helped. Motherboard have newest BIOS, Ram are in A2/B2 slots, with slots A1/A2 no difference.

 

[lude1962]

Aida results
CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Read Speed
4x Core i5-4690K 3900 MHz [ TRIAL VERSION ] Z97 Ext. Dual DDR3-2400 10-12-12-31 CR2 35275 MB/s


CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Write Speed
4x Core i5-4690K 3900 MHz [ TRIAL VERSION ] Z97 Ext. Dual DDR3-2400 10-12-12-31 CR2 36946 MB/s

CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Latency
Core i5-4690K 3900 MHz [ TRIAL VERSION ] Z97 Ext. Dual DDR3-2400 10-12-12-31 CR2 50.3 ns
I'm 2x4

Interesting side note from the aida list of other tested configurations (ddr4 doesnt seem any quicker)
CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Read Speed
4x Core i7-7700K HT 4200 MHz ASRock Z270 Extreme4 Z270 Ext. Dual DDR4-2133 15-15-15-36 CR2 30898 MB/s

 

[solidair]

Just overclocked mine to 2400mhz from 1866mhz try 10-11-12 30 and timing to 1