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Dedicated PhysX Card Experiment - How Powerful Does it Have to Be? Linus Tech Tips

post #1 of 82
Thread Starter 

(Put this in general because it is probably also relevant to people using the ATI + PhysX workaround)
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post #2 of 82
Wow the results actually surprised me, guess people will stop saying all you need is a 8800 card for physx.
post #3 of 82
Dude has the most annoying voice.
Not to mention his unboxings etc all he does is read off the box.
post #4 of 82
Quote:
Originally Posted by alchemik View Post
Wow the results actually surprised me, guess people will stop saying all you need is a 8800 card for physx.
to be clear, that was a 8600
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post #5 of 82
I'm sorry, but linus is a straight up noob. He was using the bottom pci-e slot for the 8600gts, and the middle pci-e slot for the gtx 550 ti and likely the other cards as well. This creates a problem because the bottom pci-e slot is running off of the chipset's pci-e lanes, where as the middle pci-e slot is running off of the cpu. I bet you this is why his results are so extreme.
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post #6 of 82
Quote:
Originally Posted by alchemik View Post
Wow the results actually surprised me, guess people will stop saying all you need is a 8800 card for physx.
A G92 8800 is a whole lot more powerful than a 8600. Considering a 8600 is 53% as powerful as needed to run it optimally, a card roughly twice as powerful will do the trick. A GTS250 or 260 would probably be overkill.

Quote:
Originally Posted by Behemoth777 View Post
I'm sorry, but linus is a straight up noob. He was using the bottom pci-e slot for the 8600gts, and the middle pci-e slot for the gtx 550 ti and likely the other cards as well. This creates a problem because the bottom pci-e slot is running off of the chipset's pci-e lanes, where as the middle pci-e slot is running off of the cpu. I bet you this is why his results are so extreme.
Why would this be an issue? Even PCI-e 2.0 x4 would probably not bottleneck a 8600.
    
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post #7 of 82
Quote:
Originally Posted by angrysasquatch View Post
Why would this be an issue? Even PCI-e 2.0 x4 would probably not bottleneck a 8600.
Because there is a decent difference between pci-e bandwidth for the chipset and for the cpu. There is much higher latency going through the chipset, and we don't even know if the chipset is creating issues for physx because of driver issues or what not.

All i'm saying is that I don't really believe these results unless the test method is exactly the same across the board, which it isn't.
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post #8 of 82
Quote:
Originally Posted by Behemoth777 View Post
Yeah, it amazes me how many people get paid to review hardware when half the time they don't know what the hell they are doing. Linus is a noob, I don't know why he has this job.
I wish I was paid to review hardware - I at least have some idea of what I am doing.
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post #9 of 82
Fizz-ex.

I wish he would just say "physics".
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It's a computer!
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post #10 of 82
Anyway, this thread is an excellent addition to OCN because it proves that what we have been saying all along is correct: make sure that whatever card you are using for PhysX processing is not so slow that it bottlenecks the main card.
It's a computer!
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It's a computer!
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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