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Test GPU without frying motherboard

I recently upgraded my build to an ITX case. I got myself a new motherboard and although my GPU was hanging pretty close to a wall/separation thing, it ran at normal temperatures, even in games. 

Yesterday, while I was tinkering in blender (nothing huge), my screen suddenly turned black and quite a lot of smoke started coming out of my PC. I immediately turned everything off, but damage was already done and it wouldn't turn on again (nothing happened). 

Today I took everything apart and looked for anything burned, to no avail (even under my GPUs backplate). All components smell of burnt plastic, but I think the GPU does the most. So I took out the GPU and disconnected all unnecessary components, but yet again, nothing turned on. Thinking the PSU might be the culprit, I tested it with a paperclip and it worked (or at least the fan did). Finally, I replaced the motherboard (using my old one) and everything worked fine. So I'm guessing my ITX motherboard fried somehow. That leaves the GPU. Considering it smells the most and the new motherboard broke, is it safe to test my GPU with the old motherboard, or will it fry it as well?

PSU: Seasonic G-550
New motherboard: ASRock H110M-ITX
Old motherboard: ASRock H170A-X1/3.1
CPU: Intel core i5 6600 (w/ stock cooler)
GPU: 8 GB Sapphire Radeon R9 390X Nitro
RAM : 2x 16GB G.Skill Ripjaws F4-2400C15D-16GVR
Storage: 1 Tb Toshiba HDD and 512 GB SanDisk SSD

TL;DR: new motherboard broke. I want to test my  GPU with another board but don't want to break it as well, in case the GPU is the reason my new board fried.

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I wont risk it. I mean, technically  you can take off the card's cooler and observe burnt marks (considering it poured smoke, something must have burnt), but just because you dont see the culprit doesnt mean it's fine.

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1


Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync


Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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