lowering CAS to fit ram into motherboard

wanderervan

Prominent
Jun 26, 2017
3
0
510
hi all

can CL 11, 13, 13, 31
be lowered to
10, 12, ,12 ,31

to fit with the motherboard values?

i have a crossblade ranger and made the msitake of not checking the 4 numbers before ordering a pair of Corsair Vengeance Pro 16GB (2x8GB) DDR3 2400MHz PC3 19200 Desktop RAM, Red.

i have read that the voltage might need a change but what would that mean in numbers?

i have used old ram with 9, 10, 9, 24 and they might be causing blue screen crashes and freezes, so i changed it to 9, 9, 9, 24 but not changing the voltage or the 1333mhz. and i still have the problem. what would be best to change to in voltage for each.

how do i change mhz values, i cant seem to find an xmp setting in the BIOS, i use amd.

ty for reading :D
 
Solution
Okay, this would be the RAM that you purchased and your mobo
https://pcpartpicker.com/product/NwR48d/corsair-memory-cmy16gx3m2a2400c11r
https://pcpartpicker.com/product/PdNp99/asus-motherboard-crossbladeranger

Now RAM speed is a function of speed (MHz) and timings (the number you list above which are actually CL-tRCD-tRP-tRAS-CMD)
http://www.hardwaresecrets.com/understanding-ram-timings/

All DDR3 RAM actually has standard JEDEC design parameters of 1333MHz and either 1.35V for DDR3L or 1.50V for DDR3. By design all DDR3 RAM must be able to withstand 1.80V without incurring damage. This does not mean that it will work, just that it won't be damaged. JEDEC also specifies that for each speed possible for DDR3 there is also a standard...
Okay, this would be the RAM that you purchased and your mobo
https://pcpartpicker.com/product/NwR48d/corsair-memory-cmy16gx3m2a2400c11r
https://pcpartpicker.com/product/PdNp99/asus-motherboard-crossbladeranger

Now RAM speed is a function of speed (MHz) and timings (the number you list above which are actually CL-tRCD-tRP-tRAS-CMD)
http://www.hardwaresecrets.com/understanding-ram-timings/

All DDR3 RAM actually has standard JEDEC design parameters of 1333MHz and either 1.35V for DDR3L or 1.50V for DDR3. By design all DDR3 RAM must be able to withstand 1.80V without incurring damage. This does not mean that it will work, just that it won't be damaged. JEDEC also specifies that for each speed possible for DDR3 there is also a standard set of timings.
https://en.wikipedia.org/wiki/DDR3_SDRAM

RAM manufacturers are not bound to these standard parameters and for the enthusiast market they produce RAM that is guaranteed to work at some settings faster than the standard base settings. These base settings are listed as the Serial Presence Detect (SPD) settings and this is what the BIOS will default the RAM to when it is inserted. You have to change these settings to get the higher performance, either by selecting the XMP/AMP setting or by setting the values manually. It is these performance settings that the RAM is marketed on as you can see from the tested values listed in the specifications tab in this link. Note that the SPD settings are at 1.5V while the tested settings are at 1.65V.
http://www.corsair.com/en-us/vengeance-pro-series-16gb-2-x-8gb-ddr3-dram-2400mhz-c11-memory-kit-cmy16gx3m2a2400c11r

You don't have to exactly match both speed and timings to fit some motherboard standard, it is a matter of finding what settings produce a stable operating environment. You can increase speeds and lower timings until the RAM becomes unstable at which point you might increase the applied voltage to overcome the instability. Of course there is a limit to the amount of voltage that can be safely applied before things start to blow up. And pushing one parameter of the RAM timings to far can cause instability too.

There is one other factor in this puzzle that is not RAM related, it is the capability of the CPU and/or mobo's ability to manage the memory process. 2400MHz is pretty fast DDR3 and FM2+ CPU's will likely struggle to keep up, producing instability and Blue Screens Of Death (BSOD's).

Okay, theory is over, now practical. First, download HWInfo64, it is free.
https://www.hwinfo.com/download.php

Once you run it the system summary will have a "Memory Modules" box with all the standard and XMP timings for your installed RAM. You can use these settings as is or as a template from which to work.

Your mobo's manual is here.
http://dlcdnet.asus.com/pub/ASUS/mb/SocketFM2/Crossblade_Ranger/E9512_Crossblade_Ranger_Guide_web_only.pdf?_ga=2.231127455.1296832024.1498564209-1754614606.1484660086

You can use the Tweeker menu (page 3-8) in your BIOS to set the RAM parameters. You must first under the "Ai Overclock Tuner" dropdown select "D.O.C.P" for XMP profiles or "Manual" for setting each parameter individually. To activate the "OC Tuner" and "DRAM Timing Control" drop downs you need to select "Manual". Memory speed is set via the "Memory Frequency" drop down box (page 3-9). Timings are set via the "DRAM Timing Control" drop box. DRAM voltages are set by selecting "OK" on "OC Tuner" and then using the enabled "DRAM Voltage" control.

Last, here's a guide on how to manually overclock DDR3 RAM. And an extremely long winded reply is done, sorry about that but I found it difficult to respond any way else.
http://www.masterslair.com/memory-ram-overclocking-guide-ddr3
 
Solution

wanderervan

Prominent
Jun 26, 2017
3
0
510


ty for all the info, i have tried out and found the best settings. i found another problem that might have been making things more troublesome which is the shift from intel on my old rig that died and it might not be compatible with the new system. the drivers had to be deleted. and the BIOS needed to be updated as well.
set the ram to 2133mhz and timings seem to be at their original, even though the DOCP setting decided on its own.
why 1333mhz is standard is probably a computer math thing i dont understand. the spd and jedec numbers never make any sense to me as they are different from the actual mhz setting in BIOS.

have a great late summer :D