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Topic Title: processor changed speeds
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Created On: 03/21/2004 05:29 PM
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 03/21/2004 05:29 PM
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angelgoth
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Posts: 1
Joined: 03/21/2004

I just recently upgraded my motherboard, while keeping all my other hardware, harddrive, dvd-cd rom, ram, and my AMD Athlon XP 2400+ CPU. At least this was the speed of the CPU in my old motherboard. Now since i put it in my new one the speed is only at 1800+. I tried changing settings in the bios but nothing is there to tweak or change. What is the problem here? If it helps it's a Compaq Presario Desktop. I changed their motherboard for a newer and better one for gaming. Please help, this is driving me nuts
 03/21/2004 05:35 PM
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duckwaffle
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Joined: 12/26/2003

Are there any jumpers on the mobo that need to be adjusted?

-------------------------
New System:
Asus A7N8X-E Deluxe | NVIDIA® NFORCE2 Ultra 400 + MCP-T Chipset | AMD AthlonXP 3200+ 400mhz FSB Barton Core CPU (2.2 Ghz) | Kingston PC3200 DDR RAM 512MB x 2 | 80 GB Seagate HD | GeForce 4 Ti 4200 128MB
 03/21/2004 11:29 PM
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SolarisR
Overclocker

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Joined: 01/22/2004

Incorrect Identification of AMD Athlon™ XP Processor


An AMD Athlon™ XP processor that is being recognized as a lower model by the system's BIOS is likely running at a slower frequency than it should be running at, due to the front side bus (FSB) setting of the motherboard. The FSB of an AMD Athlon XP processor typically runs at an effective frequency of 266, 333, or 400MHz. The corresponding motherboard FSB physical frequency should be set to 133, 166, or 200MHz, respectively.

Motherboards that support multiple FSB frequencies will typically have the FSB set at the lowest frequency by default (typically 100MHz) to protect lower FSB processors from accidentally being overclocked. Consequently, if a processor that requires a higher FSB frequency is installed on a motherboard that is set to a lower FSB frequency, the processor will be operating at a lower frequency than it is capable of, causing it to be recognized as a lower model processor. This is a result of the processor's multiplier. The function of the multiplier is to multiply the bus frequency to derive the processor’s operating frequency.

For example, an AMD Athlon XP 3000+ processor (333MHz FSB) has an internal 13x clock multiplier and requires a 166MHz motherboard bus frequency. This results in a processor frequency of 2167MHz (“bus frequency” x “multiplier” = “processor frequency”). However, if the motherboard's bus frequency is set to 100MHz, the processor will only operate at 1300MHz (100MHz bus frequency x 13 multiplier = 1300MHz CPU speed). For a list of processors and their respective clock multiplier/bus speed settings, see the table below.

The FSB is usually configured by a setting in the BIOS or a hardware jumper on the motherboard. Please consult your motherboard manufacturer to determine how to correctly set the FSB for your motherboard. CAUTION: Setting the FSB higher than the processor's specification may result in permanent thermal damage to the processor.



AMD Athlon XP Processors Core OPN Model Operating Freq.(MHz) Clock Mult. Nominal Voltage Max Die Temp. FSB Freq.(MHz) L2 Cache
Model 10
"Barton" AXDA3200DKV4E 3200+ 2200MHz 11x 1.65V 85º C 400MHz 512KB
AXDA3000DKV4E 3000+ 2100MHz 10.5x
AXDA3000DKV4D 3000+ 2167MHz 13x 333MHz
AXDA2800DKV4D 2800+ 2083MHz 12.5x
AXDA2600DKV4D 2600+ 1917MHz 11.5x
AXDA2500DKV4D 2500+ 1833MHz 11x
Model 10
"Thorton" AXDC2400DKV3C 2400+ 2000MHz 15x 1.65V 85º C 266MHz 256KB
AXDC2200DKV3C 2200+ 1800MHz 13.5x 1.60V 85º C
AXDC2000DKV3C 2000+ 1667MHz 12.5x 1.60V 90º C
Model 8
"Thoroughbred" AXDA2700DKV3D 2700+ 2167MHz 13x 1.65V 85º C 333MHz 256KB
AXDA2600DKV3D 2600+ 2083MHz 12.5x
AXDA2600DKV3C 2600+ 2133MHz 16x 266MHz
AXDA2400DKV3C 2400+ 2000MHz 15x
AXDA2400DUV3C 2400+ 2000MHz 15x 1.60V
AXDA2200DUV3C 2200+ 1800MHz 13.5x
AXDA2200DKV3C 2200+ 1800MHz 13.5x 1.65V
AXDA2100DUT3C 2100+ 1733MHz 13x 1.60V 90º C
AXDA2000DUT3C 2000+ 1667MHz 12.5x
AXDA2000DKT3C 2000+ 1667MHz 12.5x 1.65V
AXDA1900DLT3C 1900+ 1600MHz 12x 1.50V
AXDA1800DUT3C 1800+ 1533MHz 11.5x 1.60V
AXDA1800DLT3C 1800+ 1533MHz 11.5x 1.50V
AXDA1700DUT3C 1700+ 1467MHz 11x 1.60V
AXDA1700DLT3C 1700+ 1467MHz 11x 1.50V
AXDA1600DUT3C 1600+ 1400MHz 10.5x 1.60V
Model 6
"Palomino" AX2100DMT3C 2100+ 1733MHz 13x 1.75V 90º C 266MHz 256KB
AX2000DMT3C 2000+ 1667MHz 12.5x
AX1900DMT3C 1900+ 1600MHz 12x
AX1800DMT3C 1800+ 1533MHz 11.5x
AX1700DMT3C 1700+ 1467MHz 11x
AX1600DMT3C 1600+ 1400MHz 10.5x
AX1500DMT3C 1500+ 1333MHz 10x


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