DDR3 and CL4

[ground]

I've recently been playing with a few BBSE kits and found 2 particularly interesting sticks - they can do 32m on air at 5-8-5-18@2000. Now I have a couple CPUs that can't do 2000, some even fail at 1800. Is there a way to get CL4 and maybe even CL3 working on boards that don't have that option in BIOS? 
For anyone doubting it:


Can't currently do a rerun as I fried the IMC of that i5 while trying to push it even further... (run is just a test if it completes 32m, zero OS tuning and basically stock clocks)



2000 5-8-5 is the limit in Dual channel, I had up to 2020 5-8-5 working in single channel. 

Test system:
Kit: Gskill RipjawsX DDR3 2200 9-9-9-27 @1.65V
CPU: i5 750 (now dead, lousy clocker)
MB: Gigabyte H55M-UD2H
GPU: 8600 GT 1GB

other BBSE I tested:

OEM dual rank BBSE handled 2000 5-9-6 at 1.86V (only tested two sticks, but they both seemed to handle about identical, maybe 0.02V difference between the two sticks)
OEM single rank BBSE - stopped testing after 2000 7-11-7 refused to work no matter the voltage; gonna try again once I have a new CPU with a decent IGP, maybe these need lower frequency or something like that.

~Ground

[Bones]

CL4 was stated by the bot to be an invalid timing, this issue came up during another comp sometime ago.
Although it says it's running at CL4 it's considered a bug if it's showing because in reality it isn't nor ever will truly run at CL4.

I tried to find the thread about it but coudn't since it's a way older thread by now, maybe one of the other guys can find it quickly.

[ozz]

i wouldnt mind some ddr3 sticks that run at cas 4 lol, i have psc's 1600's, 2000's, 2200's that are 7-7-7-20 and 24's, i can go to 6 cas  but not after you start clocking up, just wont do it, too tight

[ground]

Ah, managed to find what you are talking about... Too bad, would have loved some DDR3 CL4, this RAM should be capable :/ community.hwbot.org/topic/30979-the-official-hwbot-oc-challenge-october-2011-thread/?tab=comments#comment-122673

[Vinster]

good to know. though, I've never had a kit do better than CL7. You have yourself a great kit there ground.

Can you post a picture of them?

Vin

[ground]

Aug 20, 2018 22:18:19 GMT -5 Vinster said:

good to know. though, I've never had a kit do better than CL7. You have yourself a great kit there ground.

Can you post a picture of them?

Vin

Sure!




Top to bottom:

2x2000 5-8-5-18 @ 1.84V
2000 5-9-5 @ 1.9V or 2000 5-9-6 @1.86V
2000 5-9-6 @ 1.86V (won't do 5-9-5 under any circumstances, at least during my testing)
2xgarbage single sided
Gonna test some more active cooling on the OEM DIMMs next, have a kit of dead corsair doms coming in the next couple days. Sadly no way of running even 5-9-5 in triple channel because the two good sticks don't like anything above 1.86V (negative scaling).

[Mr.Scott]

I have a few CAS 6 DDR3 kits. Never attempted CAS 5. I will try now though.

[Vinster]

when you do your memory testing like that, are you doing it on the bios level and reboot/memtest86? or are you doing that in windows with Memset?

Vin

[Mr.Scott]

Can't change CAS in windows. Only in the bios.

[ground]

Aug 21, 2018 20:37:15 GMT -5 Vinster said:

when you do your memory testing like that, are you doing it on the bios level and reboot/memtest86? or are you doing that in windows with Memset?

Vin

Just doing testing if it passes the benches I intend to run, that's why I'm here anyways Not quite sure how fast these DIMMs could go at 100% stable settings, and I don't have the time for that (nor do I care - I'm not using 2 GB dimms for a daily), even this already took quite a while to get to work. Before killing the CPU I was setting everything in BIOS, boot up and run 32m. 

I have some more plans with these once I pick up a new CPU, but I'm not sure how far I'll actually go. Current idea involves some old Corsair Dominator heatsinks (That glue is absolutely terrible to remove btw), a 65x100x1.5mm Vapour chamber (large enough even for triple channel off course), a peltier and an old CPU heatsink... Again, not 100% sure if I'll actually go do this, just a silly idea I had...