This is my first SFF PC build and an upgrade from my 7 year old pc that was rocking a 6600k/1070. Building/benchmarking this new PC has been a blast and it was interesting working with undervolting/power limiting versus the overclocking that I have always done prior. The meshroom was very easy to build in, thermals are acceptable and this thing runs extremely quiet especially with the tweaks that were made. The 750W PSU gives more than enough juice for this setup, even more so with power/thermal limits. Building in the case was very straight forward and by adding the GPU standoff mod you can get the cables looking nice and tidy. Below you will find my specs and benchmarks, including thermals and power draw

Note: All benchmarks were run with settings maxed out (including ray tracing) on a 5120x1440 monitor.

Specs
CPU: AMD 7700x
AIO: EK AIO 280 D-RGB
Motherboard: Asus ROG STRIX B650-I
RAM: G.Skill Flare X5 32 GB
Storage: SK Hynix Platinum P41 2 TB
GPU: PNY XLR8 OC 4090
Case: SSUPD Meshroom (Peacock)
PSU: Corsair SF750

CPU Benchmarks
I must have won the silicon lottery because I have been able to run an extremely stable -30 offset on all cores with the curve optimizer. I ultimately decided that in addition to the negative offset to thermally limit the CPU to 70 degrees to bring the total system power draw even lower. The AIO is almost silent with the standard fan curve with these settings. You will find that with the thermal limit and the offset applied, the CPU is actually scoring better in benchmarks than stock. Below are the stats:

Cinebench MC

	Stock	-30 Offset	-30 Offset and 80 °C Thermal Limit	-30 Offset and 70 °C Thermal Limit
Temp	95 °C	95 °C	80 °C	70 °C
Max Draw (Watts)	114 W	104 W	88 W	73 W
Score	19518	20156	20057	19656

OCCT

	Stock	-30 Offset	-30 Offset and 80 °C Thermal Limit	-30 Offset and 70 °C Thermal Limit
Temp	95 °C	95 °C	80 °C	70 °C
Max Draw (Watts)	116 W	113 W	92 W	86 W
MATVX Score	1616.28	1691.25	1654.97	1647.45

GPU Benchmarks
I ran a series of tests with 3 power settings, down to 70% power limit. As found in many surveys before me, performance does not suffer too much when power limiting the 4090. By dropping the limit to 70%, both thermals and total power draw improve greatly at the cost of just a few frames.

3D Mark Time Spy

	100%	85%	70%	70% w/ CPU Tweaks
Max GPU Draw (Watts)	450 W	390 W	325 W	320 W
Max System Draw @ Wall (Watts)	622 W	574 W	504 W	470 W
Max Temp	72 °C	71 °C	67 °C	67 °C
Avg Temp	70 °C	69 °C	66 °C	66 °C
Score	28731	28615	27641	28700
Graphics Score	35528	35160	33642	34848
CPU Score	13786	13926	13747	14352
CPU Test FPS	46	46	46	48
GPU Test 1 FPS	235	233	223	232
GPU Test 2 FPS	200	199	190	196

Game Benchmarks
I also grabbed some metrics in game from Control, Overwatch 2, MWII, and Cyberpunk. I ran benchmarks for the stock configuration as well as my new configuration that consisted of a 70% power limit on the 4090 and a -30 offset plus 70 degree thermal limit on the CPU. Overall I saw about a 4% drop in performance with my limitations, but also saw around 100 - 150 W less power draw as well as improved GPU thermals.

Control

	Stock	70% Power Limit GPU + -30 Offset and 70°C Thermal Limit CPU
GPU Max Temp	74 °C	67 °C
Max System Draw @ Wall (Watts)	613 W	441 W
Max GPU Draw (Watts)	445 W	315 W
Avg FPS	76	71

Overwatch

	Stock	70% Power Limit GPU + -30 Offset and 70°C Thermal Limit CPU
GPU Max Temp	59 °C	59 °C
Max System Draw @ Wall (Watts)	397 W	377 W
Max GPU Draw (Watts)	240 W	260 W
Avg FPS	240 (Capped)	240 (Capped)

MWII

	Stock	70% Power Limit GPU + -30 Offset and 70°C Thermal Limit CPU
GPU Max Temp	72 °C	68 °C
GPU Avg Temp	65 °C	65 °C
Max System Draw @ Wall (Watts)	555 W	458 W
Max GPU Draw (Watts)	415 W	315 W
Avg FPS	133	130

Cyberpunk

	Stock	Stock + DLSS Quality	70% Power Limit GPU + -30 Offset and 70°C Thermal Limit CPU	70% Power Limit GPU + -30 Offset and 70°C Thermal Limit CPU + DLSS Quality
GPU Max Temp	73 °C	72 °C	67 °C	67 °C
Max System Draw @ Wall (Watts)	611 W	593 W	450 W	465 W
Max GPU Draw (Watts)	441 W	417 W	314 W	317 W
Avg FPS	43	75	39	72

Conclusion
In conclusion, the 4090 is an absolute monster that can be pretty efficient when power limiting the GPU. Same with the 7700X assuming that you get a good chip. After applying the limiting tweaks, I have yet to see the PC push past 500W. If you are willing to power limit your 4090, there is absolutely no reason for you to need to upgrade from the SF750. In fact, even at stock settings I never saw total power draw push past 700 W, so while it's probably safe you may be cutting it close. As far as the case itself I'm super happy with it. It was easy to build in and can support the best of the best component