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Question about tRFC

post #1 of 4
Thread Starter 
Hi, I just noticed that the row refresh cycle time of my new memory kit at it's rated speeds is very high when I looked at other people's results.

My RAM specs

G.skill Trident x 2400 32gb (4x8) on my Rampage IV Extreme

CL 10
tRDC 12
tRP 12
tRAS 31
tRFC 347
CR 2T

I would like to know is that normal at all and wherter it's available to be lowered and how much. I would also like to know could command rate 1 be used with my kit and how much would it improve performance.

-Thanks beforehand
post #2 of 4

That may be the best it can be.  I have a 2 x 4 GB kit of 1866 MHz Ripjaws X Series, and my tRFC is at 150 with it set to Auto.  I'm assuming that if I were to somehow get my memory to 2400 MHz, then my tRFC would probably have to be at about 350 or higher too.

 

Regarding 1T vs. 2T:  all I can recommend is experimentation.  However, I think you won't notice a difference in real-world performance.

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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #3 of 4
Thread Starter 
Well, I have seen people with 32gb RAM kits at 2400 with a lot lower tRFC settings so I just started to wonder where I do have a too high amount myself.
post #4 of 4
It's true that tRFC must often be increased dramatically with very high density DIMMs, especially when used two per channel, and high clock speeds complicate this further. However, I've never seen a tRFC setting that high.

I'd be wary about reducing it; at that density and speed it may well be necessary, and a lose tRFC doesn't hurt performance much.

As for command rate, very few setups with two DIMMs per-channel are completely stable with a CR of 1.
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CPUMotherboardGraphicsRAM
5820K @ 4.3/3.6GHz core/uncore, 1.225/1.2v Gigabyte X99 SOC Champion (F22n) 2x Sapphire R9 290X Tri-X OC New Edition (10036... 4x4GiB Crucial @ 2667, 12-11-12-27-T1, 1.37v 
Hard DriveHard DriveHard DriveCooling
Plextor M6e 128GB (fw 1.05) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Cooler Master Nepton 280L 
OSMonitorKeyboardPower
Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
CaseMouseAudio
Fractal Design Define R4 Logitech G402 Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Reference R9 290X w/Stilt's MLU 1000e / 1375m E... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
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CoolingOSPowerCase
Noctua NH-D14 Windows 7 Pro x64 SP1 Antec TP-750 Fractal Design R5 
Audio
ASUS Xonar DS 
CPUMotherboardGraphicsRAM
i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
Hard DriveHard DriveCoolingOS
Intel 600p 256GB NVMe 2x HGST Travelstar 7k1000 1TB Corsair H55 (temporary) Windows Server 2016 Datacenter 
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