is it ok for ccd1 to be on sleep while gaming?

[Mando772004]

i noticed in games, CCD1 on the 7950X3D is enabled but on sleep while CCD0 is doing all the work even when i have preferred cores on bios set to auto instead of cache. is this normal? im asking because i was seeing some videos on apex and their frames pretty much barely drop from 300 and mine seems to be like 260-300 it fluctuates, the performance is good but it seems it should be higher, this is on a 4090 on 1440p max settings

[Mando772004]

in alan wake 2, ccd1 also does some work but its mainly ccd0

[WereCat]

With 7950X3D specifically it's necessary to have 1CCD asleep in games or you'll lose performance

[Mando772004]

2 minutes ago, WereCat said:

With 7950X3D specifically it's necessary to have 1CCD asleep in games or you'll lose performance

ok so that is normal?

[WereCat]

1 minute ago, Mando772004 said:

ok so that is normal?

Yes

[Gat Pelsinger]

@Mando772004

 

The 7950X3D has a hybrid CCD design, where one CCD has the 3d-vcache, and the other does not. If you were to keep both CCDs active while gaming, the non-3d-vcache CCD would have to communicate with the 3d-vcache CCD, which is not a big problem (although there is always going to be latency between inter-CCD communication, especially with AMD who has tile-based CPUs instead of Monolithic CPUs like Intel), but also communicate with the actual 3d-vcache itself, who's access is going to be way slower for the non-3d-vcache CCD, which is a big problem and will slow down performance.

But I think both the CCDs should be working at their fullest on a heavy multithreaded workload, even at the cost of inter-CCD communication because the power of more cores is going to out way that problem.

[Mando772004]

2 hours ago, Gat Pelsinger said:

@Mando772004

 

The 7950X3D has a hybrid CCD design, where one CCD has the 3d-vcache, and the other does not. If you were to keep both CCDs active while gaming, the non-3d-vcache CCD would have to communicate with the 3d-vcache CCD, which is not a big problem (although there is always going to be latency between inter-CCD communication, especially with AMD who has tile-based CPUs instead of Monolithic CPUs like Intel), but also communicate with the actual 3d-vcache itself, who's access is going to be way slower for the non-3d-vcache CCD, which is a big problem and will slow down performance.

But I think both the CCDs should be working at their fullest on a heavy multithreaded workload, even at the cost of inter-CCD communication because the power of more cores is going to out way that problem.

when i use cinebench both ccds work just fine and they reach clock speeds of 4.95 on one ccd and almost 4.8 on the other ccd but in games only one ccd is used which is i guess like you just mentioned more ideal for performance in gaming, i guess thats really what these 3d cpu's are for when you enable prefer cache in bios. Thanks!

[Bagzie]

4 hours ago, Mando772004 said:

when i use cinebench both ccds work just fine and they reach clock speeds of 4.95 on one ccd and almost 4.8 on the other ccd but in games only one ccd is used which is i guess like you just mentioned more ideal for performance in gaming, i guess thats really what these 3d cpu's are for when you enable prefer cache in bios. Thanks!

This is perfectly normal behaviour,  Its also the reason that if you only game that you get a 7800X3D.

 

7950X3D in gaming is basically a 7800X3D whilst being close to a 7950X in productivity workloads.

[Mando772004]

2 hours ago, Bagzie said:

This is perfectly normal behaviour,  Its also the reason that if you only game that you get a 7800X3D.

 

7950X3D in gaming is basically a 7800X3D whilst being close to a 7950X in productivity workloads.

yes you are right but i do use this and will plan to use this in even more workload scenarios, not just gaming so it made more sense to get a 7950X3D, The 3D chips behave in a way i personally am new to so i was kinda confused but you guys helped me. Thank you!