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Graphic card design question

StellarLight
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So I have a computer with two graphics cards and realized an issue with heat in theory. Graphics cards fans pull air up and to the side. This leads to heat build up on the back of the card, especially if you have a second card above it. Why do they not add a few holes through the pcb and have some air flow through and pull heat out in the direction dictated by physics as it would be cheaper energy wise? 

Desktop: CPU: AMD Ryzen 9 3950x  | Motherboard: B450 Tomahawk | RAM: G.Skill Trident Z Neo Series 32GB @ 3600 MHz | GPU: EVGA GeForce RTX 3080 Ti FTW3 | Case: Phanteks Enthoo (black) | Storage: 512GB Adata SU800 SSD + 1TB Sabrent M.2 + 8TB Seagate External HDD | PSU: EVGA Supernova G2 850W | Monitor: LG 27GN950-B

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That's what blower coolers exists for when you can't afford waterblocks.

Personal Desktop":

CPU: Intel Core i7 10700K @5ghz |~| Cooling: bq! Dark Rock Pro 4 |~| MOBO: Gigabyte Z490UD ATX|~| RAM: 16gb DDR4 3333mhzCL16 G.Skill Trident Z |~| GPU: RX 6900XT Sapphire Nitro+ |~| PSU: Corsair TX650M 80Plus Gold |~| Boot:  SSD WD Green M.2 2280 240GB |~| Storage: 1x3TB HDD 7200rpm Seagate Barracuda + SanDisk Ultra 3D 1TB |~| Case: Fractal Design Meshify C Mini |~| Display: Toshiba UL7A 4K/60hz |~| OS: Windows 10 Pro.

Luna, the temporary Desktop:

CPU: AMD R9 7950XT  |~| Cooling: bq! Dark Rock 4 Pro |~| MOBO: Gigabyte Aorus Master |~| RAM: 32G Kingston HyperX |~| GPU: AMD Radeon RX 7900XTX (Reference) |~| PSU: Corsair HX1000 80+ Platinum |~| Windows Boot Drive: 2x 512GB (1TB total) Plextor SATA SSD (RAID0 volume) |~| Linux Boot Drive: 500GB Kingston A2000 |~| Storage: 4TB WD Black HDD |~| Case: Cooler Master Silencio S600 |~| Display 1 (leftmost): Eizo (unknown model) 1920x1080 IPS @ 60Hz|~| Display 2 (center): BenQ ZOWIE XL2540 1920x1080 TN @ 240Hz |~| Display 3 (rightmost): Wacom Cintiq Pro 24 3840x2160 IPS @ 60Hz 10-bit |~| OS: Windows 10 Pro (games / art) + Linux (distro: NixOS; programming and daily driver)
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On 7/5/2019 at 7:59 PM, StellarLight said:

So I have a computer with two graphics cards and realized an issue with heat in theory. Graphics cards fans pull air up and to the side. This leads to heat build up on the back of the card, especially if you have a second card above it. Why do they not add a few holes through the pcb and have some air flow through and pull heat out in the direction dictated by physics as it would be cheaper energy wise? 

The Sapphire vega 56 has kind of a neat design that I don't see too often but kind of along the lines of what you describe. 

article-1280x720.c62aca5a.jpg

Ryzen 2600 - Sapphire Pulse Vega 56 - Corsair Vengeance LED DDR4 3000 C15 2x8GB - Corsair Force MP500 NVMe PCIe M.2 240GB - 2x Seagate Barracuda 2TB - 

AsRock B450 PRO4 - Deepcool Earlkase Case -  Seasonic Foucus+ 650

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