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http://h30434.www3.hp.com/t5/Notebook-Hardware/Probook-6570b-Are-the-CPU-amp-GPU-upgradeable/td-p/5079207

The CPU’s are upgradeable. According to HP’s product bulletin the following should be supported:

3rd Generation Intel® Core™ i7-3540M (3.0 GHz, 4 MB L3 cache, 35W, 2 cores)*
Up to 3.70 GHz with Intel Turbo Boost Technology
3rd Generation Intel® Core™ i7-3520M (2.90 GHz, 4 MB L3 cache, 35W, 2 cores)*
Up to 3.60 GHz with Intel Turbo Boost Technology
3rd Generation Intel® Core™ i5-3380M (2.90 GHz, 3 MB L3 cache, 35W, 2 cores)*
Up to 3.60 GHz with Intel Turbo Boost Technology
3rd Generation Intel® Core™ i5-3360M (2.80 GHz, 3 MB L3 cache, 35W, 2 cores)*
Up to 3.50 GHz with Intel Turbo Boost Technology
3rd Generation Intel® Core™ i5-3340M (2.70 GHz, 3 MB L3 cache, 35W, 2 cores)*
Up to 3.40 GHz with Intel Turbo Boost Technology
3rd Generation Intel® Core™ i5-3230M (2.60 GHz, 3 MB L3 cache, 35W, 2 cores)
Up to 3.20 GHz with Intel Turbo Boost Technology
3rd Generation Intel® Core™ i5-3320M (2.60 GHz, 3 MB L3 cache, 35W, 2 cores)*
Up to 3.30 GHz with Intel Turbo Boost Technology
3rd Generation Intel® Core™ i5-3210M (2.50 GHz, 3 MB L3 cache, 35W, 2 cores)*†
Up to 3.10 GHz with Intel Turbo Boost Technology
3rd Generation Intel® Core™ i3-3130M (2.60 GHz, 3 MB L3 cache, 35W, 2 cores)
3rd Generation Intel® Core™ i3-3120M (2.50 GHz, 3 MB L3 cache, 35W, 2 cores)*†
3rd Generation Intel® Core™ i3-3110M (2.40 GHz, 3 MB L3 cache, 35W, 2 cores)*†
2nd Generation Intel® Core™ i3-2370M (2.40 GHz, 3 MB L3 cache, 35W, 2 cores)*†
Intel® Celeron® B840 (1.90 GHz, 2 MB L3 cache, 35W, 2 cores)*

with a better CPU you also get some slightly better integrated graphics. If you want discrete graphics, HP supports the following graphics card: AMD Radeon™ HD 7570M, with 1 GB dedicated GDDR5 video memory