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Thread: Should I match RAM speed to FSB, or go for max speed?




  1. #11
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    Yes, upping the Voltage will most likely be necessary for 2 reasons. One to get em' up to 200mhz, and for stability once you are there.
    Try running them at 2.7v.

    And all the info K6 asked, if you have any trouble.

    Chez

  2. #12
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    Quote Originally Posted by Mista K6
    THen you can either keep your multiplier at 9 to keep the CPU at stock speed (no clue why, unless your cooling isnt that great) or set the multiplier to 10, 10.5, or 11, to get a nice o/c (2-2.2GHz).
    Question: I have the XP 2800+ Barton Core. I'm considering overclocking by changing the multiplier. Do I have to physically unlock my chip first, or can I just adjust the multiplier in my BIOS settings?

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  3. #13
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    Dec 2002
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    with that CPU and mobo you should be able to do it in the BIOS
    I've gone too far and need to move on!

  4. #14
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    Nov 2001
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    ok, here is what i got from my bios...

    CPU External Frequency: 166MHz
    System Perfomance: Optimal
    CPU Interface: Optimal
    Resulting Frequency: Optimal
    Memory Timings: Optimal

    SDRAM Active Precharge Delay: 7
    SDRAM RAS to CAS Delay: 3
    SDRAM RAS Precharge Delay: 3
    SDRAM CAS Latency: 2.5T

    FSB Spread Spectrum: Disabled
    FSB Spread Spectrum: Disabled
    CPU Vcore: 1.650V
    Graphics Aperture Size: 128mb
    AGP Frequency: Auto
    DDR Reference Voltage: 2.6V
    AGP VDDQ Voltage: 1.5v

    i have a stock cooler on my Barton 2500+ voltage, so im not looking to overclock my CPU. it runs at about 42 doing not much so i dont want to push it till i get a new cooler...

    Mista K6, are you saying put my Barton (333FSB) up to 400fsb? or just the memory...
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  5. #15
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    Actually, EVERYTHING goes up to 400FSB. Ok, I dont know how much you know o/c'ing, but this is just a little background info. AMD systems run on a 2x bus (to run insync with DDR RAM), as opposed to the quadpumped (4x) bus of Intel systems. For instance, The stock 333 Bus is that 166MHz External frequency x 2. DDR 333 (PC2700) RAM also runs stock at this (166x2, hence DDR). However, DDR400 (PC3200) runs STOCK at 400 (200x2). Look in your BIOS for something called RAM sync ratio (it can be called by different names). Usually it'll be 1:1 or 4:3 or something. See, 1:1 means the RAM runs the same as the FSB and the CPU, i.e. a 333FSB with a CPU running at 333FSB and the RAM running at 333 (stock PC2700 RAM) (actually everything is running at 166x2, but anyways). 4:3 would mean the RAM is running at 4/3 the speed of the FSB (and CPU). A hypothetical system using this would be your 333FSB 2500+ running at 333, but having PC3200 runnings at 400. However, best performance is usually gotten from running everything in 1:1 ratio. So, using you CPU and PC3200 RAM, everything starts out at 333FSB (stock). Of course, running PC3200 at 333 is way under stock, hence we'll boost it up :thumb:. So, bit by bit you raise the MHz of the FSB (taking the RAM and CPU along with it) from 333 (you'll actually be raising the 166 number, but remember, its 166 x 2) to 400FSB. As you raise the MHz, raise the voltages a little, and check your temps to make sure your CPU cooler can handle it. Also, lower the multiplier as you go up, as running too high a multi can crash your comp too. You shouldnt have to relax the RAM timings because, even at 400, the PC3200 RAM is running at STOCK. The end product, providing everything goes well, should be a 400 FSB (your CPU running at 400 FSB ) and the RAM also running at 400. However, dont keep your stock multiplier of 11, cause 400 FSB at an 11 multiplier (200 x 11) is 2.2 GHz. Although the Barton can probably take it, you might not wanan try it yet. Relax the multi to 10 or 9 and see how your CPU runs. If its still cool enough, and everything is okey dokey, then you can increase it and get even more performance (maybe back up to 11). However, most of the performance gain will come from upping the FSB, as it runs your entire computer much faster now. Sry, that was really long, but I hoped it helped, reply back if you need more info or if I messed up up somewheres. : peace2: Mista K6
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  6. #16
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    I recommending overclocking by FSB rather than multiplier...you will get much better performance...

    For example:

    200x11=2200

    Is faster than

    183x12=2200

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  7. #17
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    Quote Originally Posted by Soulburner
    I recommending overclocking by FSB rather than multiplier...you will get much better performance...

    For example:

    200x11=2200

    Is faster than

    183x12=2200
    I'm afraid that this depends on the mainboard. Let us consider a modern motherboard (one that supports a 200MHz FSB as you give for an example). Now lets look at a couple of scenerios...

    * 200x11 - When a modern board gets set to this speed, it also adjusts the clock ratio so that all peripherals are running at no faster than default speeds. This means that your PCI ported peripherals are running at exactly a 33.3 MHz and the AGP card is running at exactly 66.6 MHz. This means that the only components performing at the higher level of performance are the memory and the processor.

    * 183x12 - At this setting you will find that the peripherals will be running at a higher level of performance along with the memory and processor. This can often aid in overall benchmark results and even give a noticeable boost while running different applications. Of course, the quality of the peripherals will play a large part in regards to whether you will be successful with this type of overclocking.

    This is why I have always stated that there are no guarantees when it comes to playing with speed. There are simply too many factors to say what will work best on any given system... it just takes some patience and common sense.
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