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Starting Issues with RAM and OC

post #1 of 4
Thread Starter 
Hey everyone!

Ok, so I just bought some new RAM (mushkin eXtreme Performance (2 x 1GB) 184-Pin DDR SDRAM Unbuffered DDR 500 (PC 4000) Dual Channel Kit System) for my computer. I am looking to get the CPU clock speed up to 250 so that I can run the RAM 1:1.

I have a 3.0 processor which I have run at 3.75, so I know the processor can work it. When I tried getting the speed of the bus to 1ghz, and put the RAM setting up to 500Mhz, I start the computer and I can hear that only the hard drives are going.. the screen stays blanc.

I can successfully start the computer with a clock speed of 240, so 3.6? Ghz. Everest home edition says that hte RAM is running PC3200, for some reason... but the RAM is labeled PC4000.

I am wondering if it is a power issue, I have a 420W Silent Purepower power supply. I am a little confused... can anyone help me with this? Thanks!!!!

Also I am a litte confused about the RAM timings. The manufacturer says the timings should be 3-4-3-8. My BIOS setting has 5 options though. CAS# latency, RAS# precharge, RAS# to CAS# delay, Precharge delay, Burst length. Anyone know which is the extra one, or what I should do with it? Also there is the DRAM idle timer. I have it set at 0T... should I change this? THANKS!
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3.0E Asus P4P-800-E Deluxe 420W Silent Purepower Thermaltake 
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My System
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3.0E Asus P4P-800-E Deluxe 420W Silent Purepower Thermaltake 
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post #2 of 4
i am pretty certain that the problem is your mobo can only support pc3200 and maybe 2700. i have a p4p800 se and i know it supports up to pc3200. i am fairly certian thats what it is. check in your manual to see the max RAM you can use and report back to me if i am wrong
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CPUMotherboardOSMonitor
P4 2.6C Northwood Asus P4P800SE 865PE Windows XP Professional Dell E773c 
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Dell Quietkey Rosewill RV500S-2 Antec SLK3000-B Dell 2-button optical 
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CPUMotherboardOSMonitor
P4 2.6C Northwood Asus P4P800SE 865PE Windows XP Professional Dell E773c 
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Dell Quietkey Rosewill RV500S-2 Antec SLK3000-B Dell 2-button optical 
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post #3 of 4
Quote:
Originally Posted by odannyboy000
i am pretty certain that the problem is your mobo can only support pc3200 and maybe 2700. i have a p4p800 se and i know it supports up to pc3200. i am fairly certian thats what it is. check in your manual to see the max RAM you can use and report back to me if i am wrong
Read this FAQ.
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CPUMotherboardGraphicsRAM
Opteron 165 CCBBE0610DPMW DFI LP NF4 Ultra-D BFG 7800gt OC 2Gb G.Skill HZ 
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Windows XP SP2 NEC MultiSync 1760V Microsoft Aspire 520W 
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CPUMotherboardGraphicsRAM
Opteron 165 CCBBE0610DPMW DFI LP NF4 Ultra-D BFG 7800gt OC 2Gb G.Skill HZ 
OSMonitorKeyboardPower
Windows XP SP2 NEC MultiSync 1760V Microsoft Aspire 520W 
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TT Armor Microsoft 
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post #4 of 4
Hi Bongbasher

Got your message, ya your right we do have similar systems, although different RAM, and I have a 3.2 instead of 3.0 P4 so you can probably get a little higher fsb than me. One thing that you said that caught my attention is that you say your ram is set to 500 in the bios. That may be your problem. Whatever you set it to in the bios, is then added to once you overclock. So if you set it to 500, it does run at 500 if you don't overclock and your fsb is at 200. Once you overclock, it will go above that 500 depending on what you set the fsb to. Your actually using a divider, with the ram running faster than the cpu, which is not going to help performance wise.

For example, if the ram is set to 500, then you put the fsb up to 240, the ram is actually now running alot faster than 500. DDR ram, when running dual channel, runs at twice the speed of the fsb, only when it's set to 400 in your bios (this is 1:1, 200fsb x2 =ddr400-------then added to by overclock 210fsb x2 = ddr420).

On mobo's like ours, the reason to buy ddr500 ram is to have some headroom to overclock, so you can reach a good fsb. Unless you can actually hit 250fsb, you won't get the full 500 out of them, which is fine, more important is to run 1:1 with the cpu at whatever fsb you can hit. Keep the ram set to 400 in the bios, if you can reach 250fsb, you'll hit ddr500 speeds. Then you run 1:1 and the ram and cpu will have the same bandwidths, which is desirable. You can check the bandwidth in Everest along with your temps. If the bandwidths are the same, then your 1:1 and golden dude.

Running a divider with the cpu going faster will increase perfomance some if your cpu is up to it. But running it the other way with ram running faster is kind of pointless, it won't help with performance. Once you find out your max settings, then play with the ram timings lowering them as much as you can. Just so you know though, performance will benefit more from extra fsb than from ram timings, so don't sacrifice alot of fsb for a little better timings, it's not worth it.

As far as your timings, if I were you I'd leave all that on auto until you find your max OC, then start tweaking the timings. All the timings will impact performance to some degree I think, but the first one CAS will impact performance the most. I just got some new corsair xms ram with 2 CAS, but I can't set them to that since I'm overclocking this much, very good ram though. It's actually premium DDR400 ram so it will overclock well, and I've also done the vdimm volt mod to give them some more juice. I was having problems with my crucial ddr500 getting artifacts in games at high fsb's even though I was rock solid stable. I read about alot of others having this same problem with this mobo in other forums, and it seemed the only fix was to get a P4C800 or get different ram. This new ram did fix it too. My timings right now as our bios shows them are 2.5,3,3,5,4. The best would be 2,2,2,5,4 which I could probably hit with no OC, but at my 240+fsb it won't do it. As far as the idle timer and refresh rate, I have them set to auto right now until I find what the optimum settings are (if anyone knows, please speak up! ). I read varying things about what to set those two at, so I'll figure it out later, I'll let you know if I find that one out. Other settings in your bios you may want to change for best performance and/or stability: performance mode-turbo (for performance), spread spectrum-disabled (for stability), memory acceleration mode-enabled (for performance). Play with these performance settings though and run some benchmarks to see how much (or if) they help.


I hope that answers some of the questions you have. I'm kind of a noob at overclocking myself, but I've read alot and I know computers pretty well, so I'll help you if I can . Good luck! Let us know how it turns out or if you have more questions.
    
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I7 920 D0 @4GHz Asus P6X58D-E evga gtx260 896mb core216 superclocked 6GB Kingston HyperX 
Hard DriveOptical DriveOSMonitor
4x WDRaptor 74G Raid0 BenQ DW1655 Win7 Home Premium 64bit Samsung 226BW 
KeyboardPowerCaseMouse
Logitech G15 Seasonic S12 600W Antec Nine Hundred Logitech G7 
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S&S Steel 
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