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DDR2 RAM Speed?

post #1 of 27
Thread Starter 
Should I always keep my ram set at 533MHz to be in sync with my FSB? Is there a difference in performance over having it set at 667MHz? I have PC5300
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post #2 of 27
Being in sync with the FSB is the ideal situation, since it is more efficient. The RAM specification is simply the maximum speed it was designed to run. It will run just fine at slower speeds.

My RAM actually performed worse when set to 667 with a 533 FSB, because of the extra overhead within the memory controller resulting from having to sync data transfers between two different speed busses. Use the memory test in Sandra to confirm which setting is fastest. Besides, you can run tighter timings with the lower frequency for an even bigger boost.
    
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post #3 of 27
The only way to know for sure is trial and error. Yes, 1:1 is theoretically the best, but a real performance gain can be had on some systems by running the RAM faster than the CPU. Try a variety of settings and use what works best for your gear.
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post #4 of 27
Thread Starter 
Ok so if I was to over clock to 9x333 I should set my ram to 667 which is the max for my ram but will result in a 1:1 sync. Right now I'm running my E6600 at 300x9 with ram set to auto at 5,5,5,15, 1.8V. What is the best program to determine how the ram is performing?
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post #5 of 27
The best way to test performance is to use programs that closely resemble the primary application you run (e.g. check fps on some games if you're a gamer, run through several percent of a WU if you're a folder, etc.).

Don't get too caught up in the "maximum" speed of any component. The whole idea of overclocking is to push things beyond the max. to get better performance.

It would really help us to help you if you would enter your system specs through your User CP (add system option) so we can see all of your components.
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post #6 of 27
Thread Starter 
updated my info
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post #7 of 27
Thread Starter 
What sould I set my ram timings to be. Right now they are 5,5,5,15
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post #8 of 27
Quote:
Originally Posted by scupkin View Post
What sould I set my ram timings to be. Right now they are 5,5,5,15
Leave it at those timings and see how far you can get...
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post #9 of 27
Thread Starter 
I just manual set my ram from auto 5,5,5,15 667MHz to (1:1FSB) 266MHz 4,4,4,12. The lower the latency the faster it should be right?
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i5 2500k @ 4.3Ghz Asus P8z68-V Pro/Gen3 EVGA GTX 570SC @ (850/1700/2000) 2 x Kingston DDR3-1333 4GB 
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My System
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CPUMotherboardGraphicsRAM
i5 2500k @ 4.3Ghz Asus P8z68-V Pro/Gen3 EVGA GTX 570SC @ (850/1700/2000) 2 x Kingston DDR3-1333 4GB 
Hard DriveOptical DriveCoolingOS
Western Digital Caviar Blue 500GB SATA 6Gb/s Asus 24x DVD Burner Sata Scythe Katana 3 CPU cooler Windows 7 
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post #10 of 27
Quote:
Originally Posted by scupkin View Post
I just manual set my ram from auto 5,5,5,15 667MHz to (1:1FSB) 266MHz 4,4,4,12. The lower the latency the faster it should be right?
Lower latencies are faster at a given clock speed than higher latencies, but higher latencies allow higher clocks. Usually, the best method is to run high latencies to find you maximum ideal overclock. If your maximum overclock is not RAM limited, then decrease the latencies to gain a little extra performance.

Use sisoft sandra to test raw ram bandwidth to find out whether a 1:1 RAM divider is faster than the 666 MHz divider. Some chipsets don't mind so much. Others, like mine, actually perform worse with the asyncronous divider.

In Sandra, my system made 2900 MB/s with a 1:1 divider, 574 (overclocked) FSB, 4-4-4-10 timings. With the divider set to run the RAM at 667 speeds, the throughput decreased to 2600 MB/s running the same 4-4-4-10 timings, even though the RAM was technically running faster.
So I stayed with the 1:1 divider. Since the clock speed is nice and low, I am able to run the timings at 3-3-3-8 and drop the command rate to 1T. This bumped my Sandra score to 3000 MB/s. Clearly the best choice! Hope this clears things up.
    
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Samsung SyncMaster B2230HD Dell Dell 350W generic 
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CPUMotherboardGraphicsRAM
E4300 @ 2.64 GHz ASUS P5LD2 Evga GeForce 7950GT 512MB 2 x 1 GB PQI TURBO DDR2 800 
Hard DriveOptical DriveCoolingOS
2x Seagate Momentus 7200.3 in RAID 0 Samsung lightscribe DVD burner intel stock Cu core with old 3 blade Thermaltak... Windows 7 Ultimate 64 bit 
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Samsung SyncMaster B2230HD Dell Dell 350W generic 
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logitec The desk Creative SBLive! 
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