Which cooler is "this cooler"?
Single fan is 1c, maybe 2c warmer. Often case airflow not being optimized will result in more difference than using just one fan. In your case (no pun) I would use the same fan as on cooler in rear exhaust and controlled same as CPU fans to suck heated exhaust from cooler out of case.
As said, MPower Max has:
Center CPU to side of 1st PCIe socket = 69mm
Center CPU to side of 2nd PCIe socket = 89mm
Center CPU to side of 1st RAM socket = 49mm
Silver Arrow SB-E = 155x105x164mm (W x D x H) with 51.5mm center CPU to front of cooler; 78mm to front of fan.
Silver Arrow IB-E = 155x105x164mm with 51.5mm center CPU to front of cooler; 78mm to front of fan.
Cryorig R1 Ultimate = 140x117.4x165.3mm with 40mm to front of cooler; 65.4mm to front of fan.
Cryorig R1 Universal = 140x115x165.3mm with 35.5mm to front of cooler; 48.5mm to front of fan.
Here is a chart of many of the top coolers size and clearances:
Code:
Cooler size comparison
(Width x Depth x Height looking from front of case with motherboard laying flat)
Cooler Heatpipes Size W/O Fans Fans RAM Clearance* CPU to Frt** CPU to PCI-E***
Akasa Medusa 8x 6mm OD 144 x 129.5 x 163mm 140mm & 120mm PWM fans 54.6mm 64.3mm
Cryorig R1 Ult 7x 6mm OD 140 x 117.4 x 165.3mm XF140(140x25) fans 45mm 40mm *2*
Cryorig R1 Uni 7x 6mm OD 140 x 115 x 165.3mm SF140(25mm) & XT140(13mm) 45mm 35.5mm *2*
K2 / Assassin 8x 6mm OD 140 x 128 x 158mm 120mm & 140mm PWM fans 48.2mM 64mm
Dark Rock Pro 2 7x 6mm OD 124 x 122 x 166mm 120mm & 135mm PWM fans 49.5mm
Dark Rock Pro 3 7x 6mm OD 133 x 123 x 163mm 120mm & 135mm PWM fans 44mm
NH-D14 6x 6mm OD 140 x 130 x 160mm 120mm & 140mm fans 49mm 62mm
NH-U14S 6x 6mm OD 150 x 52 x 165mm + fans 46mm 26mm
NH-D15 6x 6mm OD 150 x 136 x 165mm 2x 140mm fans *1* 67.5mm
PH-TC14PE 5x 8mm OD 140 x 159 x 160mm 2x 140mm fans, PWM adaptor 45-50mm 72mm
Megahalem 6x 6mm OD 130 x 74 x 158.7mm + fans 39.45mm 37MM
SS HE01 6x 6mm OD 140 x 119 x 160mm 1x 140x38mm PWM fan 47mm 47.5MM *2*
Archon SB-E 8x 6mm OD 155 x 53.6 x 170.2mm + fans 42.35mm 26.8mm
Archon IB-E 8x 6mm OD 155 x 53.6 x 165.2mm + fans 48.2mm 26.5mm 69mm 8.5mm***
Silver Arrow 4x 8mm OD 147 x 123 x 163mm 2x 140mm Fans 45.87mm 61.4mm
SA SB-E 8x 6mm OD 155 x 105 x 164mm mid 150mm/frt 140mm PWM 36.9/44/51mm*3* 51mm
SA SB-E Extreme 8x 6mm OD 155 x 105 x 164mm mid 140mm/frt 140mm PWM 36.9/44/51mm*3* 51mm
SA IB-E 8x 6mm OD 154.6 x 103 x 164mm*** 2x 140mm 1300rpm fans 46.95mm 51.5mm 67.8mm 9.5mm***
SA IB-E Extreme 8x 6mm OD 154.6 x 103 x 164mm*** 2x 140mm 2500rpm fans 46.95mm 51.5mm 67.8mm 9.5mm***
TRUE Sp140Power 6x 8mm OD 155 x 53.4 x 170mm + fan 49.3mm 25.5mm *2* 70mm 5mm***
HR-22 8x 6mm OD 150 x 120 x 159mm + fan 41mm
* add 3mm for motherboard to bottom fin
** center CpU to front of cooler W/O fan
*** Center CPU to PCIe side (base is off-center for better PCI-E slot clearance)
*1* recessed lower fins, the NH-D15 provide 64mm RAM clearance
*2* offest back for better RAM clearance
*3* fins are at 3 different levels
If you notice any errors, please let me know.
Edit:
With your 750D I would use 2x front, 1x (maybe 2) bottom140mm PWM intakes on CPU PWM signal control .. maybe one of them on GPU PWM signal control. This will supply air as needed by CPU & GPU coolers but be very quiet when not working under heavy load.
I am expecting a R1 Universal shortly and plan to test it and R1 Ultimate with TY-143 high cfm fan/s.