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Question about my amd sempron 2800+

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  • CPUs
  • Sempron
Last response: in CPUs
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January 18, 2006 10:42:15 PM

When I bought this cpu I was under the impression that my fsb was going to be up to 800mhz with this chip... when I look at cpuz, my FSB is only running at 208mhz, with light overclocking... so whats the problem? Is this normal? How can I increase this?

Here are my system specs which im sure you will want-

AMD sempron 64 2800+ (palermo core)
1G (2 512 sticks) of Kingston ddr333
ECS k8m800-m2 motherboard
Windows xp sp2 all updates

More about : question amd sempron 2800

January 18, 2006 11:58:10 PM

That's running fine. It's marketing jibberish. The AMD 64 chips don't use a 'FSB' anymore, they use a new bus called 'Hypertransport'. This runs with a mulitiplier (in your case x4, in full A64s it is x5) from a base clock of 200Mhz. So the 200Mhz, is times by 4 to = 800Mhz.

Edit: and if you're overclocking you will need to drop that multiplier as it is now running overspec 208*4 = 832Mhz
January 19, 2006 12:02:53 AM

alright well the problem is that when i change my cpu frequency, it automatically increases the fsb speed... it was up at like 230 when i had it all the way up, but it was giving me problems. Are there any programs to change my multipliers and what not as I cant do it in my bios, all I can change manually is my cpu frequency.. any help?
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January 19, 2006 12:06:34 AM

You won't be able to change the CPU mulitplier, it is locked. You bios should give you an HT Muliplier option (could be named something different). Look for an option with 1x, 2x, 3x, 4x. If you can't find one, your board may not support overclocking very well, or it may be a hidden setting where you need to press a key combination to activiate it.
January 19, 2006 12:13:11 AM

Ya ive looked all over the settings and its not there, so im kinda Sol... my other question is... Would upgrading my ram to pc3200 be a huge upgrade for this setup?
January 19, 2006 12:17:40 AM

The only way to change the fsb multiplier is to pinmod.....if you find a pinmod for S754 Sempron 3000+ core palermo letme know cuz I'm on tha same hole where you are...I only found pinmods for socket A models :evil: 
January 19, 2006 12:53:49 AM

Yes, I made a buch o test with my system (changing latencies and OC'ing the memory, these are my results

Sandra Memory Bandwith Benchmark

Int Buff'd iSSE2 (Mb/s) Float Buff'd iSSE2 (Mb/s)

STNDRD 2.5-3-3-8-2T( standard) lenght=8 2725,34 2724,34

CONFIG A 2-3-3-6-2T lenght=8 2730,67 2728,34

CONFIG B 2-3-3-6-1T lenght=8 3019,34 3005,34

CONFIG C 2-3-3-6-1T length=8 @ 402Mhz 3034 3032,34

CONFIG D 2-3-3-6-1T length=8 @ 404Mhz 3053 3050,67

CONFIG E 2-3-3-6-1T length=8 @ 406Mhz 3059,67 3057


Sandra Memory Bandwith Benchmark Sandra Cache & Memory Benchmark

Int Buff'd iSSE2 (Mb/s) Float Buff'd iSSE2 (Mb/s) Comb index (Mb/s) Speed factor

STNDRD 2.5-3-3-8-2T( standard) lenght=8 2725,34 2724,34 3730 8,8

CONFIG A 2-3-3-6-2T lenght=8 2730,67 2728,34 3746 8,7

CONFIG B 2-3-3-6-1T lenght=8 3019,34 3005,34 3985 7,8

CONFIG C 2-3-3-6-1T length=8 @ 402Mhz 3034 3032,34 3999 7,8

CONFIG D 2-3-3-6-1T length=8 @ 404Mhz 3053 3050,67 4025 7,8

CONFIG E 2-3-3-6-1T length=8 @ 406Mhz 3059,67 3057 4027 7,9

Sandra Memory Bandwith Benchmark Sandra Cache & Memory Benchmark AIDA 32

Int Buff'd iSSE2 (Mb/s) Float Buff'd iSSE2 (Mb/s) Comb index (Mb/s) Speed factor M READ (Mb/s) M WRITE (Mb/s)

STNDRD 2.5-3-3-8-2T( standard) lenght=8 2725,34 2724,34 3730 8,8 3062,34 1162,67

CONFIG A 2-3-3-6-2T lenght=8 2730,67 2728,34 3746 8,7 3060 1181,67

CONFIG B 2-3-3-6-1T lenght=8 3019,34 3005,34 3985 7,8 3068 1375,67

CONFIG C 2-3-3-6-1T length=8 @ 402Mhz 3034 3032,34 3999 7,8 3081,67 1379,34

CONFIG D 2-3-3-6-1T length=8 @ 404Mhz 3053 3050,67 4025 7,8 3102,67 1388

CONFIG E 2-3-3-6-1T length=8 @ 406Mhz 3059,67 3057 4027 7,9 3111 1376,67


Sandra Memory Bandwith Benchmark Sandra Cache & Memory Benchmark AIDA 32 PC WIZARD 2006 SuperPI

Int Buff'd iSSE2 (Mb/s) Float Buff'd iSSE2 (Mb/s) Comb index (Mb/s) Speed factor M READ (Mb/s) M WRITE (Mb/s) LATENCY 1M dec (seg)

STNDRD 2.5-3-3-8-2T( standard) lenght=8 2725,34 2724,34 3730 8,8 3062,34 1162,67 54 ns (97 cycles) 52

CONFIG A 2-3-3-6-2T lenght=8 2730,67 2728,34 3746 8,7 3060 1181,67 54 ns (97 cycles) 51

CONFIG B 2-3-3-6-1T lenght=8 3019,34 3005,34 3985 7,8 3068 1375,67 49ns (88 cycles) 49

CONFIG C 2-3-3-6-1T length=8 @ 402Mhz 3034 3032,34 3999 7,8 3081,67 1379,34 49ns (88 cycles) 49

CONFIG D 2-3-3-6-1T length=8 @ 404Mhz 3053 3050,67 4025 7,8 3102,67 1388 49ns (88 cycles)

CONFIG E 2-3-3-6-1T length=8 @ 406Mhz 3059,67 3057 4027 7,9 3111 1376,67 49ns (88 cycles) 48

so, if you can see how little difference is by changing latencies and speed by 10mhz system performance rose bout 10-15%
!