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DDR5 Memory

Hopper64
Level 15
Anyone know how well this new platform works with DDR5? These kits run from 4800 to over 6000. Not sure where to start here. Can’t find anything at GSkill’s site. Timings appear so loose too, but that’s comparing to DDR4 so it’s really not the same. Any tutorial on this or what to buy? I’m not clear on memory here. Thanks.
MZ790A Bios 2002, GSkill F5-8000J3848H16GX2-TZRK, 13900KS, EKWB D5 TBE 300, Seasonic Prime TX-1600 ATX 3.0, Asus Strix 4090 w/ Optimus block, Phanteks Enthoo Elite, Asus Claymore 2, Asus Gladius 3, Asus XG349C, Samsung 990, Windows 11 Pro
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8 REPLIES 8

Silent_Scone
Super Moderator
Hello,

These types of questions will become apparent after the NDA lifts this week (4th). There's other things to take into consideration in terms of changes to the standard, such as double the burst length from 8 to 16.
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Hopper64
Level 15
Thanks. Hope some kits will be available later in the week too.
MZ790A Bios 2002, GSkill F5-8000J3848H16GX2-TZRK, 13900KS, EKWB D5 TBE 300, Seasonic Prime TX-1600 ATX 3.0, Asus Strix 4090 w/ Optimus block, Phanteks Enthoo Elite, Asus Claymore 2, Asus Gladius 3, Asus XG349C, Samsung 990, Windows 11 Pro

xarot
Level 11
Judging from the start with X99/DDR4 the beginning was not smooth, would realistically expect some issues with DDR5 too. Back in the day with DDR4, 3000 kits were impossible to get, couldn't get one to even boot at DDR4-3000 which is now very low binned kit as of 2021, and prices were high. Also some 2800 kits used some weird 127.x bclk with XMP which was horrible. 🙂

But in two days we'll see.
Main: i9-10980XE - Rampage VI Extreme Encore - 64 GB G.Skill Trident Z Royal 3600 CL16 - Strix RTX 3090 - Phanteks Enthoo Primo - Corsair AX1500i - Samsung 960 PRO 1 TB + Intel 600P 1TB - Water cooling
HTPC: i7-6950X - X99-M WS - 32 GB G.Skill RipjawsV DDR4-2400 - GTX1050TI - Bitfenix Pandora - Corsair AX860 - Intel 750 400 GB + Samsung 1 TB 850 EVO
All around: i9-7980XE - Rampage VI Extreme - 64 GB G.Skill 4000 CL18-19-19-39 - Strix RTX3090 - Phanteks P500A - Samsung 960 EVO 512 GB - Water cooling

Ataemonus
Level 11
Sounds about right, to be honest.

Shamino
Moderator
dont be too tied up with the primary timings, the bottleneck is not there.
i gain more lowering 2 tertiary timings than from lower TCL/TWCL from 36/28 to 24/18

Falkentyne
Level 12
Most of the "essential" subs you tweaked on DDR4 still take the same recommended values. TRRD_S (Ras to ras delay S)=4, TRRD_L (Ras to ras L)=6 or 4, tFAW (four act win time)=16, tREFI 65535 (don't use 262144 even though it can go that high, you're risking instant stealth memory corruption or BSOD if the RAM heats up), tRFC (needs testing depending on your sticks...Hynix and Samsung may work at 260-280, Micron may need 350-400+, if TRFC is too tight you'll either fail to post or instantly crash), tRTP=8, tWR=16, and so on.

Tertiaries take some research. Look out on the forums for people who post their daily stable terts and what RAM chips and bins they are using, pay attention to VDD, VDDQ and VCCSA and go from there. Micron sticks will not take many of the same subs or terts as Hynix or Samsung. If your AIDA64 write speed ends up half of your read speed, you definitely messed up on some terts (usually some _dd or _dr values).

Hopper64
Level 15
Thanks guys. Hope to have a motherboard to check the settings in a week or so.
MZ790A Bios 2002, GSkill F5-8000J3848H16GX2-TZRK, 13900KS, EKWB D5 TBE 300, Seasonic Prime TX-1600 ATX 3.0, Asus Strix 4090 w/ Optimus block, Phanteks Enthoo Elite, Asus Claymore 2, Asus Gladius 3, Asus XG349C, Samsung 990, Windows 11 Pro

Silent_Scone
Super Moderator
Image taken from Scatterbench, shows which CL values are supported.

90465

https://skatterbencher.com/2021/11/04/alder-lake-overclocking-whats-new/
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090