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how much ram is actually needed?

post #1 of 3
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theoretically speaking, if I were folding on a server board with 2 6 series 8 core opterons and 3 gpu clients... how much ram I'd actually needed. and.. say.. if I needed 8 gb of memory, would 4 Gb of high performance memory be best? or if 16gb is good, would 8gb of high performance memory be best? for example ... comparing 16 Gibbs of 1333 at cl8 as opposed to 8gb at 2000+ (if the g34 chipsets even support that type of memory)
Edited by Domino - 2/15/13 at 12:51pm
post #2 of 3
I've heard bigadv uses up to 4gb of memory. That plus OS and a couple hundred mb for GPU/fahcontrol/etc. So maybe 8gb would work. G34 owners will hopefully answer on what memory their motherboards support. CPU speed/# cores would be the place to spend money to maximize FAH PPD over memory speed.
post #3 of 3
Quote:
Originally Posted by Domino View Post

theoretically speaking, if I were folding on a server board with 2 6 series 8 core opterons and 3 gpu clients... how much ram I'd actually needed. and.. say.. if I needed 8 gb of memory, would 4 Gb of high performance memory be best? or if 16gb is good, would 8gb of high performance memory be best? for example ... comparing 16 Gibbs of 1333 at cl8 as opposed to 8gb at 2000+ (if the g34 chipsets even support that type of memory)

Basically Magny-Cours G34 (61xx) will run at 1333, Interlagos and Abu Dhabi (62xx and 63xx) support up to 1600.

In some special cases (4P Supermicro mobo, special BIOS and special memory), MC can run at different speed and tighter latencies. But that is a special case, as said. You can start by reading here: http://www.overclock.net/t/1212613/guide-building-a-2p-4p-from-start-to-finish-along-with-ppd-benchmarks-gallery/

About the amount, the more threads you have folding=the more memory will be used. I have 48 cores folding BA right now, 32 GB total memory, Fah-core takes about 7.5% of this (~2.5 GB). I run CLI Linux and have nothing else going on this machine so I have nearly 28.5 GB free too. Recommended amount per core is 500-1000MB though, iirc.

You wanna fill up AT LEAST 2 channels/CPU, I tried with single, dual, triple and quad channel on my machine and saw a huge jump between single and dual, while the gain going up to triple and quad was less noticeable it was still a gain.

2 GB sticks will suffice, and if you fill up all channels you'd have 16GB which will be plenty. The standard these day seem to be 4 GB sticks, then you will have 32GB which is more than plenty for anything folding related. Find something that will run at or below 1.5V though. I ran the Samsung Wonder ram for a bit on my machine, they may help eek out a little extra mileage (slightly lower power consumption due to lower operating voltage).
Frigg d.y.
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Frigg d.y.
(23 items)
 
 
CPUMotherboardGraphicsRAM
i7 3770K@4600MHz 1.288V ASUS P8Z68-V EVGA Geforce GTX780Ti@1293MHz 2x4GB G.Skill TrindentX 2400 CL10@2133 CL10 
Hard DriveHard DriveCoolingCooling
Corsair Force F60 2.5" SSD OCZ Agility 3 120GB 2.5" SSD EK-Supremacy CSQ Full Nickel EK-FC Titan Nickel CSQ 
CoolingCoolingCoolingCooling
Alphacool VPP655 w/ EK D5 X-Top Rev.2 EK-Coolstream Rad XTX 360 & XSPC RS240 Phobya Balancer 150 Reservoir 3xScythe GT AP-15@7V, 2xNexus Real Silent 120mm... 
OSOSMonitorMonitor
Linux Mint 16 64-bit Windows 7 64-bit Qix Qx2710LED Evolution II 2560x1440 Dell U2311H 1920x1080 
KeyboardPowerCaseMouse
Keycool 84 w/ Cherry MX Clear  Enermax Platimax 1500W NZXT H630 Func MS3 
Mouse PadAudioOther
Qpad Sweclockers Edition BRIK DAC & AMP Ducky DK9008G2 Pro w/ Cherry MX Clear  
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