Performance comparison between Core i7-6900k and @Core i9-9900x using the following C ++ code.

[SMoai1]

Performance comparison between Core i7-6900k and @Core i9-9900x using the following C ++ code.

 Source code:

void Function (BYTE * pdst, BYTE * psrc, BYTE dbit, BYTE sbit, int width, int height)

{

    INT_PTR i;

    INT_PTR size;

    size = (INT_PTR) width * height;

    for (i = 0; i <size; i)

    {

        if (* (psrc i) & sbit)

            * (pdst i) | = dbit;

    }

}

Compiler: VisualStudio 2010 64bit

result:

PC1: i7-6900k Measurement value: 125ms

PC2: i9-9900x Measurement value: 225ms

Although PC2 has higher CPU specifications, it takes longer than PC1 and I am wondering. Why does it look like this?

Thank you.

[AlHill]

Was this test done using the same motherboard, with the same memory and peripherals for both processors?

Doc

[SMoai1]

Thank you for your reply.

It is also different from motherboard, GPU and memory.

PC1: X99-E / WS                     NVIDIA1080     DDR4-2400 16GBx8

PC2: WS X299 PRO SAGE     NVIDIA2080s   DDR4-2666 16GBx8

[AlHill]

Well, I would not support such a comparison, unless on identical platforms.

You can compare the two processors here:

https://ark.intel.com/content/www/us/en/ark/compare.html?productIds=189124,94196

Doc

[SMoai1]

The memory and the supported chipset are different between i7-6900k and i9-9900x, so the motherboard and memory are different, right? The same environment is impossible in the first place.

I guess that the two CPUs handle the code differently, but I want to know the clear difference.

[AlHill]

if the chipsets and memory and motherboard are different, you are comparing apples and oranges.

That is the clear difference at this point.

Find a motherboard that supports both prcessors and test.

Doc