Abnormal FPS issues What could be the problem?

Question

Iron

Hello. I recently bought a computer and ran into the following problem - VERY low FPS with hardware powerful enough for minimal graphics settings.
Characteristics:
CPU: Intel Pentium Core 2 Duo E5700 3.00 Ghz (Overclocked to 3.33 Ghz)
GPU: Asus Radeon 7770HD 1gb, GDDR5, 128bit, core frequency 1070 Mhz!!!
RAM: 4 bars of different frequency and manufacturer 2 Gb in general
Power supply: 400w
System: Win7 x32 license.
FPS in the range of 30 - 60. In all games, which should be 80 - 100
Monitor resolution: 1366x768
Key points:
1. Drivers are the newest.
2. V-sync is off everywhere.
3. In the Catalyst settings, everything is for performance.
4. Processor temperature 45 - 50 degrees. Video card - 45 - 52 degrees.
Please note that the GPU and CPU in the game rarely even reach 70%, despite the fact that the FPS is record low.
I beg you to help as there is no money for a specialist.

Answer 1

Strips of different frequency and manufacturer, coupled with the fact that the processor may not chew a large amount of information from the video card - as an option for low fps. Another option is the crap of Windows.

Answer 2

2GB of memory is not enough, especially for games,
if adding is not an option, dig towards the release of available resources. knocking out excess crap from wasps and software.
setting the version stuffed with components to the maximum (ultimatum) is also not a very reasonable option with a lack of memory