AMD & NVIDIA Cards in 1 PC -- Do-able ??

Pooh · 9 Sep 2013 at 18:15

I've currently got a watercooled EVGA TITAN SC in my PC. I'm doing a project to crack a password protected RAR file. From the research I've done it seems like ATI STream Technology can give a higher throughput on this type of work than CUDA based cards.

Here is the link that summarises performance
http://golubev.com/gpuest.htm

The question is - can i have the Titan as my main card and somehow have an AMD card running as a secondary card just to run the RAR password software.

Drangueos · 9 Sep 2013 at 20:05

Short answer: Yes!

you can run as many graphics cards as your motherboard supports.

Phixsator · 9 Sep 2013 at 20:10

But you may run into issues if you want to use GPU accelerated PhysX as nvidia has disabled that if an AMD GPU is detected.

lerun · 9 Sep 2013 at 20:40

There are some hacks out there you could try. Mileage may vary though....

AMD&Nvidia for Phys-x

teppic · 9 Sep 2013 at 20:42

You used to be able to run games on the AMD card and use a cheap nvidia card to get PhysX in them - when did they stop this? (Obviously there's nothing technically preventing this, which is why proprietary features in games are a bad thing!)

Confused Stu · 9 Sep 2013 at 21:36

teppic said:
You used to be able to run games on the AMD card and use a cheap nvidia card to get PhysX in them - when did they stop this? (Obviously there's nothing technically preventing this, which is why proprietary features in games are a bad thing!)

Nvidia have never allowed this, their drivers always disabled PhysX if they recognise an AMD card in the system. They released one driver that allowed it, but confirmed this was a mistake and the block was back in the next driver. Some people have found a way to modify the drivers to allow Hybrid PhysX but it's never supported and can cause strange issues on some games.

tommybhoy · 10 Sep 2013 at 11:50

Pooh said:
The question is - can i have the Titan as my main card and somehow have an AMD card running as a secondary card just to run the RAR password software.

Yes, but I imagine the AMD card needs to work off it's own monitor in order to utilise AMD rendering/stream, is it cost effective though as I imagine it would have to be a half decent AMD gpu to outperform your Titan but I don't know which gpu you would need, just the fact it would work.

The comments above, in regards to a blanket statement of Nvidia disabling PhysX if an AMD card is present-PhysX is only disabled when rendering graphics through an AMD gpu.

If you render a PhysX game through an Nvidia gpu it works as advertised regardless if AMD is present in the system or not.

Hybrid PhysX can't be done anymore teppic since PhysX 3.0 released as it defaults to using cpu cycles instead-unless it has since been done.

Pooh · 10 Sep 2013 at 12:01

tommybhoy said:
Yes, but I imagine the AMD card needs to work off it's own monitor in order to utilise AMD rendering/stream,

Hmmmm.... that's an interesting thought. It's getting into the realms of far too much agg if I've got to run the AMD card into a monitor for it to come to life re stream capabilites.

Confused Stu · 10 Sep 2013 at 12:53

tommybhoy said:
The comments above, in regards to a blanket statement of Nvidia disabling PhysX if an AMD card is present-PhysX is only disabled when rendering graphics through an AMD gpu.

If you render a PhysX game through an Nvidia gpu it works as advertised regardless if AMD is present in the system or not.

Hybrid PhysX can't be done anymore teppic since PhysX 3.0 released as it defaults to using cpu cycles instead-unless it has since been done.

Thanks Tommy - always happy to be corrected by someone who actually knows what they're talking about.

Cheers.

bru · 10 Sep 2013 at 15:25

tommybhoy said:
The comments above, in regards to a blanket statement of Nvidia disabling PhysX if an AMD card is present-PhysX is only disabled when rendering graphics through an AMD gpu.

If you render a PhysX game through an Nvidia gpu it works as advertised regardless if AMD is present in the system or not.

I assumed this was the case otherwise your screwed if you have an AMD APU.
Just out of interest does it do the same if you use Intel built in GPU?

Pooh · 11 Sep 2013 at 12:20

I ended up getting a watercooled 5870 from a well know auction site.

at £80 it's worth a punt. The 5870 seemed to give best bang for the buck.

If it bombs I can always sell it.

Thanks to all for the info.

Roady · 11 Sep 2013 at 13:55

Cracking hashes or brute force?

Come back and let us know, some figures would be great if you find the 5870 better than the Titan!

Pooh · 11 Sep 2013 at 14:00

Protection RAR 3.X, SHA1, 128-bit AES

I'm expecting it to be a little bit slower than the Titan at SHA1 but it's 1/10th of the price. I'm going to see if I can get both working on the file at the same time. My licence for the recovery tool allows up to two GPUs at a time along with the CPU.

Pooh · 11 Sep 2013 at 18:26

Just for a laugh I thought I'd dig the old 8800GTS out from the attic and throw it in the rig untill the 5870 arrives.

Amazing how the technology has come on in the last few years

90nm to 28nm
20 X RAM
10 X Memory Bandwidth
28 X Shaders

Spot which one is water cooled ??

Pooh · 13 Sep 2013 at 16:17

It works!!!!

Pretty much doubled the speed of the recovery process for a measly £80

7000/sec to 14,000/sec

$ilent · 16 Sep 2013 at 15:04

Yes you can have an nvidia gpu and amd gpu in same pc, you might need a dummy plug for the second gpu that isnt being hooked up via cable though

Pooh · 16 Sep 2013 at 15:08

$ilent said:
Yes you can have an nvidia gpu and amd gpu in same pc, you might need a dummy plug for the second gpu that isnt being hooked up via cable though

Thanks $ilent - dodn't you see my previous post titled " It works!!! "

RedvGreenOLD · 16 Sep 2013 at 15:53

If you need assistance with cracking passwords or encryption, I may be able to assist.

For info, certain departments have server farms full of GPUs just for number crunching through bruteforce, backward engineering or dictionary attacks on passwords.

$ilent · 16 Sep 2013 at 15:56

Pooh said:
Thanks $ilent - dodn't you see my previous post titled " It works!!! "

Ah sorry didnt see that, glad you got it sorted

joeyjojo · 16 Sep 2013 at 16:04

But have you cracked it yet? 6 billion isn't very many.

If you said a password could contain 94 characters (from a quick count on my keyboard!) then just allowing 6 character passwords gives you 689,869,781,056 combinations. If you let them be 12 characters you'd have over 475,920,314,814,253,400,000,000 combinations.

You're stuffed if it's not based on dictionary words. Hopefully it was compressed by a human who didn't use a strong/long password.