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How far G.SKILL Ripjaws X Series (F3-14900CL8D-8GBXM) go…?


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I wonder, how fast these DDR3 rams can go - G.SKILL Ripjaws X Series F3-14900CL8D-8GBXM:

And what chips they use - so if there is a chance for getting them run faster with more voltage - and what is the safe (or reasonably safe?) voltage limit for them.

That, of course, apply only when the chips used react well to more voltage. So, since the G.Skill logo claims "Go Beyond Limits", then I put these poor rams into Asus Z97-Pro (WiFi ac) board. Upon activating the XMP profile by switch on the board, the rams run at 8-9-9-24 2T @ 1866MHz.

The 2T can be changed to 1T and at that point, it gives with not overclocked i7 4790K, 21 739MB/sec in Memtest 4.20. The voltage is default 1.50V. When tried to set the DDR3-2000MHz memory clock settings, the board failed to post. 1866 seems to be the maximum at such settings (rest is on auto ATM). Precise settings are bellow (most "auto" values report what they are in the bios, what is marked with "???" is not shown up - does not show it's current settig in the bios).

The question is - of course - what best settings to use for these rams (there seems to be plenty of settings, including skews) and what one can expect to get from them on tight timings. Or if relaxing the timings help to get higher and that produce faster result?I checked the DDR3 ram chips list there:http://ramlist.i4memory.com/ddr3/yet the closest I found was: PC3-14900 Ripjaws XF3-14900CL9D-8GBXL (2x4GB) - 9-10-9-28 @ 1.5V - Hynix H5TQ2G83CFR-H9C

Close, but no hit. So that is not exactly helpfull. And since the rams run cold (several memtest hours) at 1.50V, then I believe they might like more voltage :) So the question is only how much, or what settings will be optimal to use to get them higher. IIRC the framerate in games stop increasing at about 2100MHz, so reaching the 2000 would be cool.

Is this possible?

The Asus Z97-Pro (WiFi ac) mainboard offer these settings for memory:

Primary TimingsDRAM CAS# Latency [Auto] [1] [31] - 8DRAM RAS# to CAS# Delay [1] [31] - 9DRAM RAS# PRE Time [Auto] [1] [31] - 9DRAM RAS# ACT Time [Auto] [1] [63] - 24DRAM Command Rate [Auto] [1] [2] - 1

Secondary TimingsDRAM RAS# to RAS# Delay [Auto] [1] [15] - 6DRAM REF Cycle Time [Auto] [1] [511] - 243DRAM Refresh Interval [Auto] [1] [65535] - 7283DRAM WRITE Recovery Time [Auto] [1] [16] - ???DRAM READ to PRE Time [Auto] [1] [15] - 8DRAM FOUR ACT WIN Time [Auto] [1] [255] - 29DRAM WRITE to READ Delay [Auto] [1] [15] - ???DRAM CKE Minimum Pulse Width [Auto] [1] [15] - 5DRAM CAS# Write Latency [Auto] [1] [31] - 8

RTL IOL controlDRAM RTL Initial Value [Auto] [1] - [63] - AutoDRAM RTL (CHAR0D0) [Auto] [1] - [63] - 0DRAM RTL (CHAR0D1) [Auto] [1] - [63] - 37DRAM RTL (CHAR1D0) [Auto] [1] - [63] - 0DRAM RTL (CHAR1D1) [Auto] [1] - [63] - 0DRAM RTL (CHBR0D0) [Auto] [1] - [63] - 0DRAM RTL (CHBR0D1) [Auto] [1] - [63] - 37DRAM RTL (CHBR1D0) [Auto] [1] - [63] - 0DRAM RTL (CHBR1D1) [Auto] [1] - [63] - 0DRAM IO-L (CHAR0D0) [Auto] [1] - [15] - 0DRAM IO-L (CHAR0D1) [Auto] [1] - [15] - 4DRAM IO-L (CHAR1D0) [Auto] [1] - [15] - 0DRAM IO-L (CHAR1D1) [Auto] [1] - [15] - 0DRAM IO-L (CHBR0D0) [Auto] [1] - [15] - 0DRAM IO-L (CHBR0D1) [Auto] [1] - [15] - 4DRAM IO-L (CHBR1D0) [Auto] [1] - [15] - 0DRAM IO-L (CHBR1D1) [Auto] [1] - [15] - 0

Third TimingstRDRD [Auto] [1] - [7] - 4tRDRDdr [Auto] [1] - [15] - 6tRDRDdd [Auto] [1] - [15] - 6tWRRD [Auto] [1] - [63] - 22tWRRDdr [Auto] [1] - [15] - 7tWRRDdd [Auto] [1] - [15] - 7tWRWR [Auto] [1] - [7] - 4tWRWRdr [Auto] [1] - [15] - 7tWRWRdd [Auto] [1] - [15] - 7DecWRD [Auto] [0] [1] - ???tRDWR [Auto] [1] - [31] - 9tRDWRdr [Auto] [1] - [31] - 9tRDWR_dd [Auto] [1] - [31] - 9

Skew ControlTransmitter Rising Slope [Auto] [0] [31] - AutoTransmitter Falling Slope [Auto] [0] [31] - AutoTransmitter Control Time [Auto] [0] [31] - AutoReceiver Rising Slope [Auto] [0] [31] - AutoReceiver Falling Slope [Auto] [0] [31] - AutoReceiver Control Time [Auto] [0] [31] - Auto

MRC Fast Boot [Auto] [Enabled] [Disabled] - EnabledDRAM CLK Period [Auto] [1] [14] - AutoChannel A/B DIMM Control [Enable Both DIMMS] [Disable DIMM0] [Disable DIMM1] [Disable Both DIMMS] - Enable Both DIMMSScrambler Setting [Optimized (ASUS] [Default (MRC)] - Optimized (ASUS)MCH Full Check [Auto] [Enabled] [Disabled] - Auto

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Thanks mate. What do you mean about the "loosen timings" more precisely, please? When I kept these settings (8-9-9-24 1T) and I bumped voltage to 1.65V, then it does post at DDR3-2000 ram settings. However there are tons of errors in memtest AND mainly - the speed shown up in memtest is still same 21 739MB/s. Interesting. Not stable and still same speed? What is going on?!

I probably need to tweak some advanced settings to get 2000MHz settings works, but if there are no speed increase then it is maybe worthless?

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