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higher ram than rated

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Name: bigbwoi2000
Date: October 7, 2005 at 23:31:07 Pacific
OS: winxp
CPU/Ram: celeron d/512
Comment:

what good is it having higher ram then reconmmended? like my computer says pc2700 but i got pc3200. what does it do better than pc2700

Hp Pavillion a1010n
Intel Celeron 2.93 GHz
160 Gb Hard Drive
512 pc3200 Mb of Ram
64 Mb Graphics Chip
Windows Xp Home Edition



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Response Number 1
Name: Fel
Date: October 8, 2005 at 02:34:21 Pacific
Reply:

no, it doesnt do any good. in fact, yor PC 3200 will run at PC2700

but if you want to overclock your system, use higher RAM bandwith

Athlon 64 2800+ @ 2.63 Ghz Stock Cooling
Timings:2-3-2-5
V-Gen 512MB pc3200
DFI Lanparty UT NF3
Abit R9550 VGuru XTurbo
525Mhz/300Mhz


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Response Number 2
Name: jam
Date: October 8, 2005 at 06:32:11 Pacific
Reply:

DDR-SDRAM is rated for the amount of bandwidth it can handle at it's default bus speed. PC3200 RAM can handle 3200MB/s @ 200MHz, but if your bus speed is set at 166MHz, it "becomes" PC2700.

As Fel said, higher rated RAM can help with overclocking. For instance, if you have an AMD CPU that runs at 133MHz (266) FSB & RAM that's rated for 133MHz (PC2100) & you wanna overclock, it's possible that the RAM will hold you back. But if you use RAM rated for 166MHz (PC2700) or 200MHz (PC3200), you wouldn't have to be concerned about over-overclocking the RAM while attempting to overclock the CPU. Another advantage to running higher rated RAM at a lower speed is that you *should* be able to tighten up on the RAM timings. PC3200 with default timings of 3-4-4-8 should be able to run at 2.5-3-3-7 or possibly 2-2-2-6 if it's run at a lower bus speed.

The thing to strive for is balance between your CPU bandwidth & RAM throughput. If your Celeron runs at 533FSB, it's bandwidth is 4267MB/s...PC2700 at 166MHz is only capable of 2700MB/s...PC3200 at 200MHz is capable of 3200MB/s. But since you need 4267MB/s to be in balance, you should have two sticks of RAM (either PC2100, PC2700, or PC3200) at 133MHz running in dual channel mode (2133MB/s x 2 = 4267MB/s). Right now, your RAM is the system bottleneck.

Just so you know, RAM ratings are actually "rounded"...here are the "real" RAM throughput numbers:

PC2100 @ 133MHz = 2133MB/s
PC2700 @ 166MHz = 2667MB/s
PC3200 @ 200MHz = 3200MB/s

ASUS A7N8X-X
Athlon XP 1800+
8.5 x 200MHz
1024MB PC3200 2.5-3-3-7
Asus A9550GE/TD 128MB
WinME/WinXP Pro SP2


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