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1866MHz or Higher OC'd Ram with AMD CPU???

post #1 of 19
Thread Starter 
Has anyone ever reached RAM speeds of 1866MHz or higher with an AMD processor? Is it even possible?

I have the system below and can't seem to get any higher than 1720MHz with the Phenom 965.

Please let me know if you have any suggestions or know how to reach RAM speeds this high with the AMD platform.

Thank you for your time...
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post #2 of 19
Do you mean you don't have an option to go that high, or the system won't boot with it that high? All depends on how you're doing your overclocking -- AMD overclocking is much more complex than SB Intel.
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post #3 of 19
I hit 1700 on my G-skills, but decided that a downclock and massively improved timings worked just as well, if not better.
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post #4 of 19
Thread Starter 
The highest the bios will let me set the RAM is 1600MHz but then I have to adjust FSB to 215 to get up to 1720MHz. When I get the FSB to 216 its unstable. I have adjusted the timings up to 11-11-11-42 and increased voltage but I cant get passed 215. Should I set the RAM to 1333MHz and set the FSB to like 260-270?
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post #5 of 19
Its been done before. I remember seeing a thread about some 2000Mhz ram running on a 1090T system. Phenoms aren't that good with high clocks though and prefer lower timings.
post #6 of 19
I've had my current RAM running at 1984 (248 base clock) 9-10-9.

So yes, it is possible. Stability depends on both the processor's intergrated memory controller and the motherboard's northbridge though.

Just remember safe maximums are somewhere around 1.4V for both, and watch your NB temps - in my experience, it heats up quickly.
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post #7 of 19
All of that depends on the voltage of your other components. Increasing the FSB will increase your CPU clock as well, so CPU voltage may need to be increased. Increasing the FSB often requires a bump to the CPU-NB voltage to keep stability as well. My old motherboard is stable up to a FSB of 270+ with CPU-NB at 1.3v, so your new board should be able to handle that fine. Also make sure your board has your RAM voltages set properly.

An FSB bump that small causing problems, even at stock voltages, seems like there may be something else going on though. Try the voltage increases first, though.
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post #8 of 19
I've always read that the Phenom II architecture benefits more from tighter timings than higher frequency. If you're looking for more performance from your RAM, try tightening the timings.
 
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post #9 of 19
Oh and to actually see if your system is capable of it, you first need to work out if you can push your base clock high enough. Some boards just hate base clock increases...

Start by putting the base clock up to 250 (what you'd need for 2000Mhz), but downclock the core multiplier, NB and SB so that they all end up at stock*, and stick the RAM on the 1333 or even 1066 setting.

So, for me, my 970 runs at 3500 stock, so at 250 I'd need to set the multiplier at 14 - 250x14 = 3500.

If everything is stable, you can go from there. Crank the RAM up to 1600 (2000 effective) and see what happens. Increase your CPU-NB and NB voltages to get stability. Increase the CPU-NB first, up to ~1.35 max. If this doesn't help, leave it at 1.35 and raise the NB voltage to ~1.35 (all of this is in steps).

If somewhere along the way, that works, back your CPU-NB down until you run into stability, and then put it back up a notch - this is your sweet spot. You don't want to give these things more voltage than they need.

Finally, you can start pushing your CPU and NB higher. Start with the CPU.
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Work in Progress
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CPUMotherboardGraphicsRAM
2700K @ 4.1 w/ 1.15v, 5.1 w/ 1.425v Asus Maximus IV Gene-Z Gen 3 nVidia GTX 285 8GB G.Skill 1866 9-10-9-24 
Hard DriveCoolingOSMonitor
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post #10 of 19
eh..my phenom doesn't like over 1600..i think it's the imc/needing 1.65+ volts thing..i just tighten the timings..and raise cpu/nb freq
 
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Thuban Powah!
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