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The amount of dual-channel RAM

post #1 of 7
Thread Starter 
Hi Everyone,

I recently asked about the best 8GB RAM for less than £50, and I was told to buy the Samsung Green (MV-3V4G3D/US) 8GB over the 8GB G.Skill Ripjaws-X F3-12800CL9D-8GBXL 1600MHX DDR3 @ £34.99. Thank you for that info.

Now, this may be a stupid question, but I do know that dual-channel 'pairs' of RAM work better together than two separate ones.

I currently have a 4GB stick of Patriot PSD34G13332. If I added the Samsung RAM to it, would it be better than replacing the Patriot memory with the Samsung 2 x 4GB sticks?

So would it be better to have (1 x Patriot) + (2 x 4GB Samsung) = 12GB OR 2 x 4GB Samsung = 8GB

It may see obvious, but not to me,

Sorry if I'm wasting anyone's time.

Jack
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AMD Phenom II X6 1090T 3.8GHz @ 1.488V ASUS Sabertooth 990FX R2.0 MSI R9 390 8GB @ 1100MHz +19mV, 1625MHz Samsung Green MV-3V4G3 8GB (2 x 4GB) Dual Channel 
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AMD Phenom II X6 1090T 3.8GHz @ 1.488V ASUS Sabertooth 990FX R2.0 MSI R9 390 8GB @ 1100MHz +19mV, 1625MHz Samsung Green MV-3V4G3 8GB (2 x 4GB) Dual Channel 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 Pro 256GB (OS & Programs) Seagate 2TB 7200.14 (Documents & Data) Seagate 500GB 7200.12 (Backup & Games) 24x DVD+/-RW Drive (SATA) 
CoolingCoolingCoolingCooling
Noctua NH-U14S CPU Cooler FRONT INTAKE: 120mm Noctua NF-S12B FRONT INTAKE: 200mm Thermaltake Colourshift SIDE INTAKE: 200mm Thermaltake Colourshift 
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post #2 of 7
Depends on your usage - a lot of motherboards will allow you to run dual channel mode and single channel mode for a single stick - if you need more than 8GB of memory, then 12GB is going to help, if you don't need more than 8GB then you're better off just using the 8GB.

My suggestion is max out the amount of programs you would ever realistically have open, open task manager and check how much memory you are using, if you're pegging 7GB+ then the 12GB would be useful, if its not over 7 then stick with the 8 thumb.gif
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post #3 of 7
Quote:
Originally Posted by appleg33k85 View Post

Depends on your usage - a lot of motherboards will allow you to run dual channel mode and single channel mode for a single stick - if you need more than 8GB of memory, then 12GB is going to help, if you don't need more than 8GB then you're better off just using the 8GB.
My suggestion is max out the amount of programs you would ever realistically have open, open task manager and check how much memory you are using, if you're pegging 7GB+ then the 12GB would be useful, if its not over 7 then stick with the 8 thumb.gif

And with this said, try benchmarking the sticks. Check memory speeds/latency with 2 sticks, and then check with 3 sticks. Previous experience shows a pretty noticible performance hit when dropping dual channel for higher memory capacity.
    
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by mezmenir View Post

Check memory speeds/latency with 2 sticks, and then check with 3 sticks.

How do I go about doing this?

Sorry if it is blatantly obvious.

I'm guessing it's via CPU-ID, but which frequency do I go by? I have NB Frequency and DRAM Frequency. I do see the CL as 9 for my Patriot 4GB.
My Gaming Rig
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AMD Phenom II X6 1090T 3.8GHz @ 1.488V ASUS Sabertooth 990FX R2.0 MSI R9 390 8GB @ 1100MHz +19mV, 1625MHz Samsung Green MV-3V4G3 8GB (2 x 4GB) Dual Channel 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 Pro 256GB (OS & Programs) Seagate 2TB 7200.14 (Documents & Data) Seagate 500GB 7200.12 (Backup & Games) 24x DVD+/-RW Drive (SATA) 
CoolingCoolingCoolingCooling
Noctua NH-U14S CPU Cooler FRONT INTAKE: 120mm Noctua NF-S12B FRONT INTAKE: 200mm Thermaltake Colourshift SIDE INTAKE: 200mm Thermaltake Colourshift 
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My Gaming Rig
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CPUMotherboardGraphicsRAM
AMD Phenom II X6 1090T 3.8GHz @ 1.488V ASUS Sabertooth 990FX R2.0 MSI R9 390 8GB @ 1100MHz +19mV, 1625MHz Samsung Green MV-3V4G3 8GB (2 x 4GB) Dual Channel 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 Pro 256GB (OS & Programs) Seagate 2TB 7200.14 (Documents & Data) Seagate 500GB 7200.12 (Backup & Games) 24x DVD+/-RW Drive (SATA) 
CoolingCoolingCoolingCooling
Noctua NH-U14S CPU Cooler FRONT INTAKE: 120mm Noctua NF-S12B FRONT INTAKE: 200mm Thermaltake Colourshift SIDE INTAKE: 200mm Thermaltake Colourshift 
CoolingOSMonitorKeyboard
REAR EXHAUST: 140mm Thermaltake Windows 10 Pro 64-bit Samsung 22" SyncMaster B2230 Memorex MX2098 
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post #5 of 7
Something like MaxxMem or similar memory benchmarking utility should give you a direct comparison of bandwidth on your platform.

Sorry about not clarifying, I didn't mean the actual DRAM latencies/speeds, I meant the effective latency and bandwidth available to the system- shown by popular benching tools.
    
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Microsoft Windows 6.4.9841 CTP Qnix QX2710LED Logitech G710 EVGA Supernova 1000 G2 
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Intel Core i7-4790K ASRock Fatal1ty Z97X NVIDIA GeForce GTX 780 NVIDIA GeForce GTX 780 
RAMHard DriveHard DriveHard Drive
32GB ADATA XPG DDR3-2400 1x 256GB Plextor M6e M.2-PCIe 2x 256GB Samsung SSD 830 2x 2TB Western Digital Black 
OSMonitorKeyboardPower
Microsoft Windows 6.4.9841 CTP Qnix QX2710LED Logitech G710 EVGA Supernova 1000 G2 
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post #6 of 7

You currently have a 4GB stick of Patriot PSD34G13332. If you added it to any new memory setup you'd buy that's rated at a higher than generic standard, you'd bottleneck and risk incompatibility with the entire setup because your Patriot DIMM is an unmatching generic 1333 CL9 kit vs. what you plan to get. Few will make use of above 8GB let alone 4GB of RAM. You'll be fine with 8.

post #7 of 7
Thread Starter 
OK thank you all very much for your help. I will sell my Patriot (if I can) and install the 8GB of RAM separately on dual channel sockets. This has clarified it for me.
My Gaming Rig
(21 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1090T 3.8GHz @ 1.488V ASUS Sabertooth 990FX R2.0 MSI R9 390 8GB @ 1100MHz +19mV, 1625MHz Samsung Green MV-3V4G3 8GB (2 x 4GB) Dual Channel 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 Pro 256GB (OS & Programs) Seagate 2TB 7200.14 (Documents & Data) Seagate 500GB 7200.12 (Backup & Games) 24x DVD+/-RW Drive (SATA) 
CoolingCoolingCoolingCooling
Noctua NH-U14S CPU Cooler FRONT INTAKE: 120mm Noctua NF-S12B FRONT INTAKE: 200mm Thermaltake Colourshift SIDE INTAKE: 200mm Thermaltake Colourshift 
CoolingOSMonitorKeyboard
REAR EXHAUST: 140mm Thermaltake Windows 10 Pro 64-bit Samsung 22" SyncMaster B2230 Memorex MX2098 
PowerCaseMouseAudio
Corsair AX860 Thermaltake Chaser MK-I AULA Ghost Shark Gaming Mouse Plantronics Gamecom 780 
  hide details  
Reply
My Gaming Rig
(21 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1090T 3.8GHz @ 1.488V ASUS Sabertooth 990FX R2.0 MSI R9 390 8GB @ 1100MHz +19mV, 1625MHz Samsung Green MV-3V4G3 8GB (2 x 4GB) Dual Channel 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 Pro 256GB (OS & Programs) Seagate 2TB 7200.14 (Documents & Data) Seagate 500GB 7200.12 (Backup & Games) 24x DVD+/-RW Drive (SATA) 
CoolingCoolingCoolingCooling
Noctua NH-U14S CPU Cooler FRONT INTAKE: 120mm Noctua NF-S12B FRONT INTAKE: 200mm Thermaltake Colourshift SIDE INTAKE: 200mm Thermaltake Colourshift 
CoolingOSMonitorKeyboard
REAR EXHAUST: 140mm Thermaltake Windows 10 Pro 64-bit Samsung 22" SyncMaster B2230 Memorex MX2098 
PowerCaseMouseAudio
Corsair AX860 Thermaltake Chaser MK-I AULA Ghost Shark Gaming Mouse Plantronics Gamecom 780 
  hide details  
Reply
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