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Temp Difference in watercooled SLI setup

I am currently running a liquid cooled loop consisting of an i7-5820k and 2 GTX 980s in SLI. I am using a Swiftech H220-X as the primary unit, and I expanded its loop. The cards are using EK-FC blocks and are connected using an EK dual parallel connector. The loop goes in this order: Swiftech (res, pump, rad combo) > cpu > 240mm rad > GPUs > swiftech. I am seeing around a 10 C difference in the GPU temps at idle, and under load, the difference goes from 20-30 C. I have made sure to get as much air out of the loop as possible, by tilting the case on its side and filling the loop up as much as possible. Is there anything else I could do? I don't remember ever having this big of a temp difference,

CPU: AMD Ryzen 7 5800X (liquid cooled) GPU: EVGA RTX 3080 Ultra non-LHR MOBO: Asus ROG Crosshair VIII Hero Wi-Fi RAM: 32GB G.Skill TridentZ RGB 3600MHz DDR4 (2x16GB) PSU: Corsair HX1200i (overkill yes, but was free!) Storage: 1 TB XPG SX8200 Pro NVMe, 2TB XPG SX8100 NVMe, 4TB WD Blue SATA SSD, 2x 480GB SATA SSDs, 3TB Seagate Barracuda 7200rpm Case: Corsair Obsidian 750D Airflow (with upgraded USB-C front panel) Sound Card: EVGA Nu Audio Liquid Cooling parts: EK Supremacy Classic RGB AMD Nickel+Plexi, EK-XRES 140 Revo D5 RGB PWM (incl. pump), 2x EK 240mm PE radiator, EK Duraclear clear tubing

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My gpu is a 10-20c difference from my CPU to gpu and I'm on air. It all depends on overclocked tdp, ambient temps, case air flow, and other random stuff.

Edit: I also keep my gpus fans down low because I like it quiet.

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LTT's Fastest single core CineBench 11.5/15 score on air with i7-4790K on air

Main Rig

CPU: i7-4770K @ 4.3GHz 1.18v, Cooler: Noctua NH-U14S, Motherboard: Asus Sabertooth Mark 2, RAM: 16 GB G.Skill Sniper Series @ 1866MHz, GPU: EVGA 980Ti Classified @ 1507/1977MHz , Storage: 500GB 850 EVO, WD Cavier Black/Blue 1TB+1TB,  Power Supply: Corsair HX 750W, Case: Fractal Design r4 Black Pearl w/ Window, OS: Windows 10 Home 64bit

 

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CPU: i5-3570K, Cooler: Stock, Motherboard: ASrock, Ram: 16GB, GPU: Intel igpu, Storage: 120GB Kingston SSD, 6TB WD Red, Powersupply: Corsair TX 750W, Case: Corsair Carbide Spec-01 OS: Windows 10

 

Lenovo Legion Laptop

CPU: i7-7700HQ, RAM: 8GB, GPU: 1050Ti 4GB, Storage: 500GB Crucial MX500, OS: Windows 10

 

 

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