In terms of overall gaming performance, the graphical capabilities of the Intel HD Pentium G1620 are significantly better than the Intel Q43 Express Chipset.

The HD Pentium G1620 was released over three years more recently than the Q43 Express Chipset, and so the HD Pentium G1620 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the Q43 Express Chipset when running the latest games.

Both GPUs exhibit very poor performance, so rather than upgrading from one to the other you should consider looking at more powerful GPUs. Neither of these will be able to run the latest games in any playable way.

The HD Pentium G1620 and the Q43 Express Chipset have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The HD Pentium G1620 has 21.3 GB/sec greater memory bandwidth than the Q43 Express Chipset, which means that the memory performance of the HD Pentium G1620 is slightly better than the Q43 Express Chipset.

The HD Pentium G1620 has 16 Shader Processing Units but the Q43 Express Chipset does not have an entry, so the two GPUs cannot be reliably compared in this area.

The HD Pentium G1620 requires 55 Watts to run but there is no entry for the Q43 Express Chipset.