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Mixing cas latencyes between dual channels.

Go to solution Solved by Meridian Prime,

Okay so, I have a little experience with this from my iMac 5k, which I used for work and gaming. Mine came with the base 8 GB memory as well and I upgraded with a 16 gig kit for a total of 24 gigs of DDR3. As far as I know I did not check the base clock speed of the default ram, I simply added the new ram. I didn't run into any issues in the 6 years since I upgraded. Your experience may differ though.

Hey, so this is for the RAM upgrade for my friend's Mac Pro from 2013. It has a small opening bay for the ram slots which seems completely impossible because it's Apple, right, user-friendly? Apple? Anyway, it's old and all I know is it has 8Gb of DDR3 RAM at 1600Mhz. So he plays Minecraft, a CPU and memory crunching game. It already has 2x4Gb and can still carry 2 other modules. Options are to take 1x8Gb, 1x4Gb, 2x2Gb or 2x4Gb. I know DualChannel is better, especially on older computers. Now here is a tricky question, so we have the existing 2x4Gb DualChannel at 1600Mhz of which I don't know the Cas latency. Now, because we want to make a second DualChannel thing, can we take any frequency and timings and will it affect the other DualChannel (the already existing one) like lowering the frequency or getting the timings to rise or will the 2 DualChannel run at their given speeds? Oh and also, is a 8gb dump to 16 worth or should he take only 4 to get 12gb? 

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Better not, it's not meant to be upgradable so no one really knows what will happen to the motherboard when it sees mismatched SPD profiles.

 

But you may be able to check with the codes on the label on the existing memory modules.

 

Add 8GB. With only 4 it will be at best 8gb dual channel and 4gb single channel and face the same unknown factor as mismatched CAS latency

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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-> Moved to CPUs, Motherboards and Memory

^^^^ That's my post ^^^^
<-- This is me --- That's your scrollbar -->
vvvv Who's there? vvvv

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Okay so, I have a little experience with this from my iMac 5k, which I used for work and gaming. Mine came with the base 8 GB memory as well and I upgraded with a 16 gig kit for a total of 24 gigs of DDR3. As far as I know I did not check the base clock speed of the default ram, I simply added the new ram. I didn't run into any issues in the 6 years since I upgraded. Your experience may differ though.

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