Only 2 Cores showing on AMD fx-4100... HELP and WHY?

[got that hype]

hi i just ran a 3dmark11 test and my scores came out okay i guess. but for some reason when i look at compared scores with the same gpu and cpu there is one weird thing. while others' scores show that they have 4 cores, mine only shows 2. this is something i dont understand. My task manager shows 4 graphs under the "processes" tab so im kinda at a loss of whats going on.


NVIDIA GeForce GTX 550 Ti video card 3DMark 11 benchmark test score


Name

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Description

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User
Got That Hype

Processor

Processor
AMD FX-4100

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Processor clock
4153 MHz

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Physical / logical processors
1 / 4

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# of cores
2

Graphics Card

Graphics Card
NVIDIA GeForce GTX 550 Ti

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Vendor
Micro-Star International Co ., Ltd.

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# of cards
1

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SLI / CrossFire
Off

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Memory
1024 MB

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Core clock
950 MHz

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Memory clock
2150 MHz

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Driver name

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Driver version
8.17.13.124

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Driver status
Not FM Approved

[Jarnis]

That is due to the complexities of Bulldozer architecture. It has two modules capable of running four threads and it is open to discussion if the modules actually have 2 "real" cores or not.

In any case I've flagged this as a potential bug in 3dmark.com for investigation. It may also be that it shows 2 or 4 depending on exact hardware configuration or depending on if the OS install is full clear install after hardware change or not.

[Horrorwood]

If you look it does say

"Physical / logical processors
1 / 4"