Yes, in addition to A10-5750M based G505S there are also A8 and A6 ones. But there are some possible problems regarding them:
1) their price is just slightly lower than with A10 - as result, price/performance ratio seems to be worse for these models
2) I'm not sure if it is possible could upgrade their APU from A6/A8 to A10-5750M after purchase
3) most importantly: some parameters inside a coreboot source code for G505S could be A10-specific ;
I am not sure if a current "A10-inclined build" would run on A8/A6 out of the box, without additional tweaking
A question from my last letter - about compatibility of G505S coreboot build with various graphics solutions found in different modifications, is not addressed yet... to remind, there are three groups of modifications:
*) only 8650G (no dual graphics)
*) 8650G + AMD HD 8570M (dual graphics)
*) 8650G + AMD R5 M230 (dual graphics, slightly faster)
P.S. Below is an =incomplete= list of SKUs for A10 G505S models that I was able to find. If there is a shortage in your country, maybe this list could assist you in search (those mods with windows 8 are about $50 more expensive and support evil M$, please dont get them ;-) )
1) only 8650G (no dual graphics) + 4GB + FreeDOS = 59-410323
2) only 8650G (no dual graphics) + 8GB + FreeDOS = 59-405169
3) only 8650G (no dual graphics) + 4GB + Windows 8 = 59-380131
4) only 8650G (no dual graphics) + 6GB + Windows 8 = 59-373010 / 59-406417
5) only 8650G (no dual graphics) + 8GB + Windows 8 = 59-403088
6) 8650G + AMD HD 8570M (dual graphics) + 4GB + FreeDOS = 59-405168
7) 8650G + AMD HD 8570M (dual graphics) + 6GB + FreeDOS = 59-409773
8) 8650G + AMD HD 8570M (dual graphics) + 8GB + FreeDOS = 59-380146 / 59-387536
9) 8650G + AMD HD 8570M (dual graphics) + 4GB + Windows 8 = 59-407135 / 59410966
10) 8650G + AMD HD 8570M (dual graphics) + 6GB + Windows 8 = 59-382102
11) 8650G + AMD HD 8570M (dual graphics) + 8GB + Windows 8 = 59-401209
12) 8650G + AMD R5 M230 (dual graphics, slightly faster) + 4GB + FreeDOS = 59-410881
13) 8650G + AMD R5 M230 (dual graphics, slightly faster) + 8GB + FreeDOS = 59-410885
14) 8650G + AMD R5 M230 (dual graphics, slightly faster) + 4GB + Windows 8 = 59-408604
15) 8650G + AMD R5 M230 (dual graphics, slightly faster) + 8GB + Windows 8 = 59-410883