First we will talk about their CPU config :-
SnapDragon 8 Gen 3
1 x 3.3 GHz (Cortex-X4)
3 x 3.2GHz (Cortex-A720)
2 x 3GHz (Cortex-A720)
2 x 2.3GHz (Cortex-A520 Refresh)
Dimensity 9300
1 x 3.25GHz (Cortex-X4)
3 x 2.85GHz (Cortex-X4)
4 x 2GHz (Cortex-A720)
GPU config:-
Snapdragon 8 Gen 3:
Adreno
Ray tracing support
Global Illumination
Dimensity 9300:
Arm Immortalis-G720 MC12
ray tracing support
Global illumination
DSP :-
Snapdragon 8 Gen 3 :
Hexagon (fused scaler, tensor , vector)
Mixws precision INT8/INT16
INT4 Support
Dimensity :
APU 790
INT8/INT16
INT4 Support
RAM Support:-
Snapdragon 8 Gen 3 : LPDDR5X
Dimensity: LPDDR5T
Camera:-
Snapdragon 8 Gen 3:
* 200MP single shot
* 108MP single with zero shutter lag
* 64MP+36MP with zero shutter lag
* Triple 36MP with zero shutter lag
* Dolby HDR photo
* Real-time semantic segmentation for photos and videos (up to 12 layers)
* 8K/30fps HDR video
* 4K/120fps slow-motion
Dimensity:
* 320MP single shot
* HDR video
* Real-time semantic segmentation for photos and videos (up to 16 layers)
* 8K/30fps
* 4K/60fps
Charing:-
Snapdragon 8 Gen 3 : Quick Charge 5
Dimensity: USB-PD PPS
4G/5G Networkig :-
Snapdragon 8 Gen 3: X75 LTE/5G (integrated) 10,000Mbps Down , 3,500 Mbps up
Dimensity: LTE/5G (integrated) 7,000Mbps Down
Qualcomm adopts a 1+5+2 CPU layout, featuring one big Cortex-X4 core, five medium Cortex-A720 cores, and two little Cortex-A520 cores. This means we’ve got one more medium core and one less little core compared to the previous flagship Snapdragon chip.
Qualcomm is amping up the clock speed here too. All of these cores are running at a higher frequency than their counterparts on the vanilla Snapdragon 8 Gen 2. That combo of higher clock speed plus newer CPU cores is pretty promising, on paper.
Meanwhile, the Dimensity 9300 eschews little cores entirely in favor of four Cortex-X4 CPU cores and four medium Cortex-A720 cores. This is a very aggressive approach at first glance.
The Dimensity 9300 brings a higher clock speed for the big X4 core, but the three other X4 cores feature a reduced 2.85GHz clock speed in line with the medium A715 cores seen in the Dimensity 9200. Meanwhile, the four Cortex-A720 medium cores here are clocked at just 2GHz. In other words, MediaTek has loads of big and medium cores, but it isn’t running all of them at full tilt, so we’re curious to see what this means for multi-core workloads.
Qualcomm also brings its top-notch Adreno GPU and X75 modem, while MediaTek relies on its in-house modem and Arm’s Immortalis-G720 MC12 graphics.
MediaTek's Dimensity 9300 VS Qualcom Snapdragon 8 Gen 3 Benchmarks!
source: Android Authority.com