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[LR] LucidLogix offers Virtu GPU as a free trial - Page 4

post #31 of 38
Awe so AMD users are left out?!

Not very NICE Lucid..........
    
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post #32 of 38
Quote:
Originally Posted by GanjaSMK View Post
Awe so AMD users are left out?!

Not very NICE Lucid..........
It's for Intel's integrated GPUs. They'll probably add support for Fusion eventually.
Thread title is misleading. They used to require you to plug your monitor cable into the onboard video out, but now they don't.
post #33 of 38
I wrote a few programs in Nvidia Cuda, which is Nvidia's general purpose programming for the GPU.

Nvidia GPUs are Single Instruction Multiple Thread so they execute the same instruction with different values to create parallel execution. The problem with this is if the instructions need to be different then the GPU must execute these instructions in series, and this is where the GPU really slows down. The GPU I have (GTX 470) is optimized for single floating point precision so it takes a bit longer for double precision calculations.

The CPU cores on the other hand are multi instruction so it is much more independent and better suited for tasks that are highly different. CPU memory is much easier to work with, as with a GPU there are at least 4 types of memory (registers, shared, local, texture, etc).

For example, a small CUDA app I made running on a GTX 470 will encrypt (XTEA) maximum 48 times faster than a single thread on a i5 2500k CPU, however it only runs 12 times faster than the i5 2500k CPU when the CPU uses 4 cores in parallel (1 core per thread, 4 threads). Keep in mind, most of this time consumption is just sending the data across the bus from main memory to gpu memory (perhaps 95% of the time).

The sad thing is, I haven't found a way to get OpenCL (alternative to Cuda) to recognize the i5 2500k's onboard GPU. I read the onboard GPU is not programmable, so someone would have to program in low level to use the onboard gpu.
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post #34 of 38
Way necro, dude.

Also, I think you meant Single Instruction, Multiple Data (SIMD) instead of Single Instruction, Multiple Thread.
post #35 of 38
Hm. I wonder how a set up of 2x 6870s and an NVS 290 (8500GT) would play out. tongue.gif
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post #36 of 38
kind of disappointing this never really took off
post #37 of 38
Its not using the CPU. Its using the Intel HD 2000-4000 onboard to do the extra work. They have certain set of instructions assigned to every game so its designed separately so it will only work on the games they list eg:-Skyrim,BF3. Its a good concept. But i would go buy 680 tongue.gif
post #38 of 38
Quote:
Originally Posted by crust_cheese View Post

Way necro, dude.
Also, I think you meant Single Instruction, Multiple Data (SIMD) instead of Single Instruction, Multiple Thread.

Sorry didn't notice the date on the thread. I just installed Lucidlogix virtu MVP and was just seeing what people thought. Personally I found that my max fps went higher, but my minimum went lower, and there was game stuttering (BC2).

About SIMD, Nvidia calls it SIMT, but SIMD and SIMT is very similar, from what I understand. Perhaps it's the idea that each data item is usually related with a thread in CUDA.
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