Why cant you use both CCD on a AMD Processor in Gaming?

[foxbill86]

Just curious, Why cant you use both CCD on a AMD Processor in Gaming? 

 

[WereCat]

You can but cross-CCD communication leads to higher latency which leads to worse performance.

[Tan3l6]

You can, just with a blow to one of CCDs that lack 3D V-cache.

Only one has it afaik.

 

Edit: If talking about X3D.

[foxbill86]

7 minutes ago, Tan3l6 said:

You can, just with a blow to one of CCDs that lack 3D V-cache.

Only one has it afaik.

 

Edit: If talking about X3D.

8 minutes ago, WereCat said:

You can but cross-CCD communication leads to higher latency which leads to worse performance.

 

what if it was was both X3D? still worse or nah? 

[Tan3l6]

Just now, foxbill86 said:

what if it was was both X3D? still worse or nah? 

Then it would still be similar to 9800X3D probably, perhaps somewhat better. because the latency between CCD-s is still a thing.

[freeagent]

Is it though?

[Tan3l6]

15 minutes ago, freeagent said:

Is it though?

Maybe?

[Haswellx86]

18 minutes ago, foxbill86 said:

 

what if it was was both X3D? still worse or nah? 

You don't want the CCDs talking to each other much. If they are dependent on each other, you suffer performance loss due to the latency.

[freeagent]

I game on a dual CCD chip every day. Granted most games run on the faster CCD, but not always. No problem.

[podkall]

You can, but you lose little bit of performance, not enough to matter, but enough to do this:

 

[podkall]

1 hour ago, Tan3l6 said:

Maybe?

 

 

 

Though 5.7Ghz could just be the non-3D CCD side.

[Tan3l6]

2 minutes ago, podkall said:

 

 

 

Though 5.7Ghz could just be the non-3D CCD side.

Indeed seems a great advantage, if the CPU can be cooled at 170W.

I have a 9800X3D that barely gets cooled at 5.3 GHz (1.175V)

 

But indeed you have a point.

[podkall]

Just now, Tan3l6 said:

Indeed seems a great advantage, if the CPU can be cooled at 170W.

I have a 9800X3D that barely gets cooled at 5.3 GHz (1.175V)

 

But indeed you have a point.

it's got double the cores, of course the wattage is almost double the x3D

 

If you look even closer, some games don't utilize the cache as much as others, so 9950x3D wins in specific games:

 

 

[freeagent]

My 9900X runs between 5600 and 5800MHz with PBO and games. 9950X should be touching 5900 with PBO.

[WereCat]

2 hours ago, foxbill86 said:

 

what if it was was both X3D? still worse or nah? 

It would negate benefit of the X3D and would still be bad because you still have extra latency in cross-CCD communication. The benefit of X3D is that you don't have to do cross-IO die to memory communication nearly as often due to extra cache as the extra cache is on the die so there is very low latency when accessing it.

 

To give a simple example.

Imagine you're painting 2 rooms but you can have the bucket of paint in only one of the rooms.

Obviously you'll paint the room where the bucket is located faster than the other room as you have to keep constantly walk back and forth to dip your brush into the bucket next door.