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Gdog96

GTX 970 power issues

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Posted · Original PosterOP

Hi

 

I have recently bought a KFA2 GTX 970 second hand, however I noticed a strange issue when stress testing it. 

 

If I stress the GPU using MSI Kombustor, the GPU power and usage will both be at or around 100%. However, the moment I begin stress testing the CPU at the same time (using prime95) the GPU usage drops to 30-40% and power to 55-60%, resulting in a massive drop in FPS. 

 

I tried using MSI Kombustors CPU burner but it only made this effect worse with power and usage dropping to 40% and 20-30% respectively. 

 

I assumed this was my power supply causing the issue as its only a 450W silverstone SFX unit. However, I tried the GPU in my friends PC with the same specs and a Corsair CX600 power supply and I found the same issue.

 

Is this normal? What can I do about it? Generally pretty confused at the moment, would love some input from you guys. 

 

Thanks 

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Hi

 

I have recently bought a KFA2 GTX 970 second hand, however I noticed a strange issue when stress testing it. 

 

If I stress the GPU using MSI Kombustor, the GPU power and usage will both be at or around 100%. However, the moment I begin stress testing the CPU at the same time (using prime95) the GPU usage drops to 30-40% and power to 55-60%, resulting in a massive drop in FPS. 

 

I tried using MSI Kombustors CPU burner but it only made this effect worse with power and usage dropping to 40% and 20-30% respectively. 

 

I assumed this was my power supply causing the issue as its only a 450W silverstone SFX unit. However, I tried the GPU in my friends PC with the same specs and a Corsair CX600 power supply and I found the same issue.

 

Is this normal? What can I do about it? Generally pretty confused at the moment, would love some input from you guys. 

 

Thanks 

i notice that effect too but not that big. But i think it is normal BECAUSE: the cpu gives the gpu the information what to do. If the cpu is maxed out, it won't be able to give commands to the gpu what to do so the load will break in.


GUITAR BUILD LOG FROM SCRATCH OUT OF APPLEWOOD

 

- Ryzen Build -

R5 3600 | MSI X470 Gaming Plus MAX | 16GB CL16 3200MHz Corsair LPX | Dark Rock 4

MSI 2060 Super Gaming X

1TB Intel 660p | 250GB Kingston A2000 | 1TB Seagate Barracuda | 2TB WD Blue

be quiet! Silent Base 601 | be quiet! Straight Power 550W CM

2x Dell UP2516D

 

- First System (Retired) -

Intel Xeon 1231v3 | 16GB Crucial Ballistix Sport Dual Channel | Gigabyte H97 D3H | Gigabyte GTX 970 Gaming G1 | 525 GB Crucial MX 300 | 1 TB + 2 TB Seagate HDD
be quiet! 500W Straight Power E10 CM | be quiet! Silent Base 800 with stock fans | be quiet! Dark Rock Advanced C1 | 2x Dell UP2516D

Reviews: be quiet! Silent Base 800 | MSI GTX 950 OC

 

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Don't run both tests at the same time... they're not meant to do that.


CPU: Intel i7-5820k [OC 4.4Ghz] | CPU Cooler: Corsair H110 | Motherboard: MSI X99S SLI PLUS | Memory: [48GB] G.Skills RIPJAWS 4 32GB (4x8) 2400mhz + Hyper X Predator 16GB (4x4) 2400mhz | GPU 1: EVGA GTX 1080 FTW [OC ~2050MHz]  | GPU 2: ASUS GTX 970 Strix [OC 1478MHz] | PSU: Corsair AX860i | OS Drive: Samsung 850 EVO SSD 250GB | Games Drive: Samsung 850 EVO SSD 500GB | Cache Drive: HP EX900 M.2 120GB | Media Drive: 2x WD Blue HDD 1TB in Raid 0 | Media Drive: 2x WD Black HDD 2TB in Raid 1 | Case: Corsair Obsidian 750D | Monitor 1: ASUS PB287Q UHD | Monitor 2: ASUS PG278Q WQHD

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If you run CPU and GPU stress tests at the same time you're going to run into a bottleneck. Your CPU is busy with its stress test so it can't fully feed the GPU, which is why its usage drops. This is perfectly normal.


i7 9700K, Gigabyte RTX 2070 Gaming OC, Gigabyte Z390 Gaming SLI, 2x8 HyperX Predator 3200 MHz

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