Well, now I am of the opinion that we are at Oberon C0 and not E0. So maybe RGT has a good source.
Komachi lists CPU ID
[Family, Model, Stepping Identifiers]
ARL A0: 00840F00 (actual 0x840f00 - 10000100 0000 1111 0000 0000)
ARL E0: 00840F40 (actual 0x840f40 - 10000100 0000 1111 0100 0000)
The last two digits represent the revision (stepping + base model). We are at base model 4 (n+1) makes revision 5 hence E0.
We know that Ariel went through A0, B0, and also saw record of Oberon A0, B0.
However, the CPU iD does not explicitly give a name for an iGPU, but Ariel and Oberon do appear to share the same base family and extended family.
So when Komachi is listing the GPU name alongside the CPU-ID , he is simply guessing or going off known associations.
10000100 0000 1111 0100 0000
Stepping = Bits 3-0 = 0000 = 0
BaseModel = Bits 7-4 = 0100 = 4
BaseFamily = Bits 11-8 = 1111 = 15
Reserved = Bits 18-12 = 0000 = 0
ExtModel = Bits 19-16 = 0100 = 4
ExtFamily = Bits 27-20 = 1000100 = 4096/512 (reset 08h) = 8
Family = ExtFamily + BaseFamily = 15 + 8 = 23 = 0x17
Model = Concat BaseModel & ExtModel = 0x44
Revision = Convert BaseModel to letter (0=A) = E + Stepping (0) = E0