Yep. That's a dell optiplex 780 sff, with a full size RX 570. : r/pcmasterrace
Dell H895D OptiPlex 380 755 760 780 model DCCY SFF CPU Heatsink Assy | 0H895D | Heatsinks | Team Spares
FOR Dell OptiPlex 740 780 server chassis fan small fan SFF PMD1208PMB1 A|chassis fan|dell optiplexserver fan - AliExpress
Dell OptiPlex 780 CPU Fan With Speaker- G944P- Refurbished - Walmart.com
Refurbished Dell Optiplex 780 Small Form Factor Desktop PC with Intel Core 2 Duo Processor, 8GB Memory, 1TB Hard Drive and Windows 10 Pro (Monitor Not Included) - Walmart.com
Dell optiplex 780 service manual--removing the fan, Removing the fan | Dell OptiPlex 780 User Manual | Page 72 / 74
OptiPlex 780 Small Form Factor (SFF) Removal guide for the Expansion Card, Heat Sink, Coin Cell and System Fan | Dell US
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New Dell OEM Optiplex 580 760 780 Destop Fan/Heatsink G928P
P041K Genuine Dell CPU Heatsink Fan Assembly LGA775 For Optiplex 960 Small Mini Tower (SMT) - video Dailymotion
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Dell Optiplex 0C992Y 780 USFF Processor CPU Heatsink with Fan Cooling Case Fan | eBay
Cooling fan for Dell OptiPlex 780 USFF CPU OPX 780USF TP39X A00 BUB0712HH 9F47 PVB070F12M 12V 0.68A centrifugal|cooling mist fans|cooling fan ledcooling fan 24v - AliExpress
C992Y 0C992Y Optiplex 780 USFF Processor / CPU Heatsink with Fan|Fans & Cooling| - AliExpress
REFURBISHED) Dell Optiplex 780 Original CPU Fan (Foxconn PVA080K12H G944P) | Shopee Malaysia
OptiPlex 780 Desktop (DT) Removal Guide for the Memory, Power Supply. Coin Cell, Fan and Internal Speaker | Dell Thailand