Aces High Bulletin Board
General Forums => Hardware and Software => Topic started by: falcon23 on July 26, 2008, 11:00:57 PM
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OK,I have upped my OC to 3.6 and it is running good..I am at 1:1 on ram,and now I would like to adjust my timings on my ram..It is OCZ with heatsinks..1600 1gig each stick..
Can one lower RAm timings fairly easily?
According to CPUZ:
DRAM frequency is 400mhz
FSB:DRAM1:1
CAS#latency 5.o clocks
tRCD 5 clocks
tRP 5 clocks
tRAS 15 clocks
command rate 2t
IF anymore info needed,please let me know..
Falcon23
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Set it to the manufacturer recommended timings and voltage. My BIOS auto setting set mine to 5-5-5-16 @ 1.85V. Recommended setting is 4-4-4-12 @ 2.00V. I set it there without issue.
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Falcon,
Yes and No, what you have already with 1:1 and 5-5-5-15 is perfect obtaining a 1:1 with solid burn testing is key. Lowering timings won't give you a significant performance increase. You should be able to go to 4-4-4-12 or even lower, but then you'll need increased voltage as well. With all my overclocks I aim for 1:1 and leave it at that. Going for tighter timings isn't really worth the possible increase in errors for the performance gain.
<S>...-Gixer
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cool,I will try and find out what my memory wants as far as timings and voltage..
Falcon23
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How do I check my timings? They should be 4-5-4-11. I know it runs at 400 and has a Cas of 4.
Would I merely up the 400 to say 433?
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Use CPUID to get exact details of RAM then go to manufactures website. Corsair for instance lists all it's RAM specs (past and present) in detail.
<S>...-Gixer
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How do I check my timings? They should be 4-5-4-11. I know it runs at 400 and has a Cas of 4.
Would I merely up the 400 to say 433?
Use CPUID or go into BIOS. Ideally you need to match RAM speed to CPU for a ratio of 1:1. Timings of 4-5-4-11 doesn't sound standard spec.
<S>...-Gixer
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Use CPUID or go into BIOS. Ideally you need to match RAM speed to CPU for a ratio of 1:1. Timings of 4-5-4-11 doesn't sound standard spec.
<S>...-Gixer
http://www.newegg.com/Product/Product.aspx?Item=N82E16820211188 Oops forgot I gave the Mushkin ram to my mom. This is my Ram
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Would I merely up the 400 to say 433?
No! That would make your DDR2 800 RAM DDR2 866. :uhoh
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No! That would make your DDR2 800 RAM DDR2 866. :uhoh
Well err uh, I was thinking DDR not DDR2.
Anyway, How do I oc ram?
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Well err uh, I was thinking DDR not DDR2.
Anyway, How do I oc ram?
Well, you would do it just as you proposed. You'de raise the core clock from 400 to whatever number you wanted (within reason) but would also have to loosen timimgs (from say 4-4-4-12 to 5-5-5-16) and raise voltage for very little if any gain.
Furthermore, if you recall, I urged you to OC you CPU to 3.6 Ghz to sync your clock speeds at 400, which you did. Now you are proposing to un-sync the RAM, which means that the RAM will be waiting on your CPU for data.
Synced clocks eliminate any bottlenecks from the process. Un-synced clocks will run as fast as the slowest component, so, unless your willing to OC your CPU higher to match your new higher RAM clock you will gain nothing and likely have stability issues as well.
Good luck.
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What he said ^^^
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Doesn't the SPD on the RAM chips, which CPU-z reads and displays, tell you what the manufacturer wants for that RAMs timing and voltage? And shouldn't "Auto" in the BIOS use those values automatically?
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And shouldn't "Auto" in the BIOS use those values automatically?
No. Auto normally sets looser timings and lower voltages to be "safe".
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And shouldn't "Auto" in the BIOS use those values automatically?
Depends where you are using 'Auto'. Some motherboards have Auto Vcore and Memory timings etc when using their overclock settings in the BIOS. There is an Auto SPD settings on most boards as well when running stock RAM settings. It should pick up the pre-determined memory timings correctly, i.e. 5-5-5-15. However on my Asus P5N-E SLI is did not auto set my RAM timings to what they were suppose to be. My bios Auto sets my ram at 4-4-4-16, when it's suppose to be 4-4-4-12, which I set manually.
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No. Auto normally sets looser timings and lower voltages to be "safe".
It must depend on the motherboard: both of mine use the SPD values. In fact that was a problem with the older Intel board: the SPD was too fast for the board but it set it to that anyway. I had to manually slow it down.
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I've got a question. I understand that FSB:DRAM of 1:1 is desirable. How do you accomplish that?
For example, I just built a system based on a 8400 and Gigabyte GA-EP35-DS3L MB. Its stock now; the CPU is at 3GHz and the "bus" is 333.3 MHz with a 9X multiplier. The memory is 400 MHz (DDR2 PC2-6400) with FSB:DRAM of 5:6. How do I get 1:1? Do I just up the CPU "bus" clock (presuming it can keep up) by 6/5 to reach 3.6GHz? Will that give just a 12% increase in benchmark or better because of better meshing of CPU and RAM?
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I've got a question. I understand that FSB:DRAM of 1:1 is desirable. How do you accomplish that?
For example, I just built a system based on a 8400 and Gigabyte GA-EP35-DS3L MB. Its stock now; the CPU is at 3GHz and the "bus" is 333.3 MHz with a 9X multiplier. The memory is 400 MHz (DDR2 PC2-6400) with FSB:DRAM of 5:6. How do I get 1:1? Do I just up the CPU "bus" clock (presuming it can keep up) by 6/5 to reach 3.6GHz? Will that give just a 12% increase in benchmark or better because of better meshing of CPU and RAM?
You have two options; overclock the CPU or underclock the RAM.
Most motherboards have an option in the BIOS under advanced chipset features to ""Link" the CPU and RAM clocks and another to "Sync" those clocks. To underclock the RAM to 1:1 just link and sync and save the changes. This will lower the RAM clock to 333.3 and you're linked and synced at 1:1.
To overclock the CPU you first have to disable Intel Speedstep, Thermal Control and C1E Enhanced Halt State. You also want to disable all Spread Spectrum settings and Link and Sync the RAM. All of this is done in the BIOS.
Next, set the CPU core clock to 400 or the FSB to 1600, whichever the BIOS allows you to adjust. Set the CPU voltage to auto, then back it down 2-3 notches (It will auto set too high). Boot up and if you boot normally run Orthos or Prime95 through at least 5-10 strings using small FFT's. If that runs normally, restart entering BIOS. Turn the voltage down two notches and try again. Keep doing this until you no longer boot or until you get Orthos/Prime95 errors, then go back to BIOS and up the voltage one notch and re-test.
The key is to get it stable with as little voltage as possible. Over volting causes heat, so monitor your temps continually while doing this. If you run over ~60C shut down and lower your CPU VCore.
At 400 clock speed at a 9 multiplyer you will be at 3.6 Ghz. If you can't run cool and stable (which you should be able to do without problems) at those settings, lower the multi to 8 and you'll be running at 3.2 Ghz which will allow you to run at lower voltage, thus with less heat.
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Well, you would do it just as you proposed. You'de raise the core clock from 400 to whatever number you wanted (within reason) but would also have to loosen timimgs (from say 4-4-4-12 to 5-5-5-16) and raise voltage for very little if any gain.
Furthermore, if you recall, I urged you to OC you CPU to 3.6 Ghz to sync your clock speeds at 400, which you did. Now you are proposing to un-sync the RAM, which means that the RAM will be waiting on your CPU for data.
Synced clocks eliminate any bottlenecks from the process. Un-synced clocks will run as fast as the slowest component, so, unless your willing to OC your CPU higher to match your new higher RAM clock you will gain nothing and likely have stability issues as well.
Good luck.
I'm leaving it alone. Thanks for the input :salute
Btw, I'm sending the E8400 back and the E8500 has a 9.5 multiplier. So that would take it to 3.8. That's plenty.