Member Avatar for crab

hi,
i recently bought an intel 3.0ht
intel 865gbf mobo(supports 800 mhz fsb)
kingston single stick 512 mb ddr(400 mhz)

my problem...(im using CPUZ software)

  • the cpu fsb is only shown as 199 mhz whle the bus speed is shown to be 799mhz...???why fsb 199mhz ONLY?

ram frequency is only 199mhz istead of 400mhz...???
http://img300.echo.cx/my.php?image=capture061320050008138lh.jpg


have i been cheated?

thanx
kind regards
omw

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Quick clarification that should sit on top of the thread: nothing hardware‑wise is wrong — this is a units/representation issue that trips up a lot of people. Good points from (DDR shows half the effective rate) and (don’t rely on one tool alone) cover parts of it; here’s a bit more context and a short checklist to verify everything.

CPU and FSB

  • Many Intel designs of that era use a low base oscillator (about 200 MHz) and a quad‑pumped FSB. Software like CPU‑Z reports the raw base clock; the marketed "800 MHz FSB" is the effective transfer rate (base clock times four). The CPU core speed you see is the base clock times the CPU multiplier.

Memory

  • DDR modules report their raw clock in tools (the "DRAM Frequency" field). DDR doubles transfers per clock, so the tool shows the physical clock and the effective DDR rate is twice that value. DIMM labels (PC3200 = DDR400) and the SPD tab in CPU‑Z confirm the rated speed.

Quick checklist to remove doubt

  • Check the BIOS: note base clock/FSB and CPU multiplier there (BIOS is the authoritative source).
  • Check the DIMM SPD and motherboard manual for the supported memory divider/multiplier.
  • Cross‑check with another utility or BIOS readout if CPU‑Z looks odd.
  • If worried about stability, run memtest (memory) and a CPU stress test to confirm real-world behavior.

When to act: only if BIOS reports different multipliers/base clocks, if the core speed is wrong, or if stress tests fail. Otherwise the numbers in your screenshots are a normal display of base vs. effective rates.

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Member Avatar for RGPHNX

Hi crab,
software diagnostics programs are VERY frequently incorrect. Get another program & re-check the fsb before you jump to any conclusions. Also do a complete RAM benchmark "burn in" test to see if you memory might be slowing down the fsb (ie bad memory),
Hope this helps :)
RGPHNX

Member Avatar for belama

Your cpu is fine. CPU-Z also shows me my FSB (800) in Bus speed. I've never thought of finding what the Bus Speed, 200mhz in your case, means.

For the RAM, it is really 200mhz but since it is DDR (Double Data Rate), we double it to make it 400mhz effectively. Like mine shows 266mhz but is really 533mhz (DDR2).

Member Avatar for crab

Your cpu is fine. CPU-Z also shows me my FSB (800) in Bus speed. I've never thought of finding what the Bus Speed, 200mhz in your case, means.

For the RAM, it is really 200mhz but since it is DDR (Double Data Rate), we double it to make it 400mhz effectively. Like mine shows 266mhz but is really 533mhz (DDR2).

hi,
thanx for ur answer. ive identified the problem. the system is just fine.....my interpretation was wrong! fsb 199mhz has to be multiplied with the multiplier(x15 given in the cpu screen shot that i sent)....so, 199.7 x 15 = 3000mhz which is the cpu speed. bus speed has to be multiplied with 4(why:- i dunno!) to get 800mhz.

thanx again

kind regards
omw

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