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The last interesting point about this unit is the existence of a mask register, which is somewhat similar to the filter register in the VMX instruction set. This register, which contains 16 Boolean values, indicates whether or not the result values are to be written to the destination register. The mask enables the use of a technique called predication. In the case of an if-then-else test, rather than trying to predict the result of the test to continue execution of the program without loss of performance, both branches are executed in parallel and only the appropriate one is kept when this register is used. When the code to be executed is in relatively short parts, this is more efficient because it avoids the risk of wrong branch predictions.
This unit is clearly the most interesting aspect of Larrabee. However, one can have a few reservations about the choice of a new SIMD instruction set. Admittedly, the SSE instruction set, which is aging and was designed to have low hardware impact, wasn’t suitable. But we also know that the teams at Intel are working on a new SIMD instruction set called advanced vector instructions (AVX). The latter has support for instructions with three operands and for MAD instructions and increases the size of the vectors it processes to 256 bits compared to 128 bits for SSE (and 512 bits for Larrabee).
It’s perfectly conceivable that Larrabee, due to its specificities, needed “exotic” instructions that have no place in a traditional CPU, and that the size of the AVX vectors was too limited. Whereas, conversely, 512-bit vectors were too much of a constraint on a standard CPU. But in practice, Intel’s language is a little contradictory. On the one hand, it points out that Larrabee supports the x86 instruction set, making it compatible with an enormous quantity of software. But on the other hand, to really make the most out of Larrabee, a new, specific instruction set is needed--one that won’t be used in other Intel CPUs.
- Intel Shows off Larrabee Chip for the first time [Graphic & Displays]
- Intel Larrabee (GPU) information . challenge to nvidia and ati radeon [Graphic & Displays]
- Larrabee versus ATI/Nvidia are we getting more choices? [Graphic & Displays]
- Are cpus losing their clout? [CPU & Components]
- GT300 NEWS [Graphic & Displays]
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very interesting, i know nvidia cant settle for being the second best. As always its good for the consumer.
Yes interesting, but intel already makes like 50% of every gpu i rather not see them take more market share and push nvidia and amd out although i doubt it unless they can make a real performer, which i have no doubt on paper they can but with drivers etc i doubt it.
I wonder if their aim is to compete to appeal to the gamer market to run high end games?
Very interesting, finally some more information about Intel upcoming "GPU".
But as I sad before here if the drivers aren't good, even the best hardware design is for nothing. I hope Intel invests more on to the software side of things and will be nice to have a third player.
cool ill wait for windows 7 for my next build and hope to see some directx 11 and openGL3 support by then.
Maybe there is more than a little commonality with the Atom CPUs: in-order execution, hyper threading, low power/small foot print.
Does the duo-core NV330 have the same sort of ring architecture?
"Simultaneous Multithreading (SMT). This technology has just made a comeback in Intel architectures with the Core i7, and is built into the Larrabee processors."
just thought i'd point out that with the current amd vs intel fight..if intel takes away the x86 licence amd will take its multithreading and ht tech back leaving intel without a cpu and a useless gpu
Driver. If Intel made driver as bad as Intel Extreme than event if Intel can make faster and cheaper GPU it will be useless.
Hope for an Omega Drivers equivalent lol?
Damn, hoped there would be some pictures
. Looks interesting, I didn't read the full article but I hope it is cheaper so some of my friends with reg desktps can join in some Orginal Hardcore PC Gaming XD.
I was quite suprised by the quality of this article and am quite eager to see the follow up.
Well I am looking forward to Larrabee but I'll keep my optimisim under wraps until I start seeing some screenshots of Larabee in action playing real games i.e. not Intel demo's.
I wonder just how compatible larrabee is going to be with older games?
Great article! Keep ones like this coming!
Hope for an Omega Drivers equivalent lol?
That would be FANTASTIC! Maybe the same people who make the Omega drivers could make alternate Larrabee drivers? We all know Intel sucks balls at drivers.
So this is Intel's approach to a GPU... we put lots of simple x86 cores in it , add SMT and vector operations and hope that they would do the job of a GPU. IMHO Larrabee will be a complete failure as GPU but as an x86 CPU that is highly parallel this thing could screw AMD's FireStream and NVIDIA's CUDA (OPENCL too) beacause it's x86 and the programming is pretty popular for this kind of architecture.
Yes interesting, but intel already makes like 50% of every gpu i rather not see them take more market share and push nvidia and amd out although i doubt it unless they can make a real performer, which i have no doubt on paper they can but with drivers etc i doubt it.
Yeah but that 50% includes all the integrated cards that no consumer even realizes they're buying most of the time.. but not in discrete cards. I'd like to see a bit more competition on the discrete side.
"Simultaneous Multithreading (SMT). This technology has just made a comeback in Intel architectures with the Core i7, and is built into the Larrabee processors." just thought i'd point out that with the current amd vs intel fight..if intel takes away the x86 licence amd will take its multithreading and ht tech back leaving intel without a cpu and a useless gpu
Umm, what makes you think that AMD pioneered multi-threading? And Intel doesnt use HyperTransport, so they cant take it away.
Now we know what they're trying to do with it. There's still no indication if it will work or not.
I really don't see the 1st gen. being successful-it's not like AMD and nVidia are goofing around waiting for Intel to join up and show them a real GPU. Although there's no numbers on this that I've seen, I'm thinking Larry's going to have a pretty big die size to fit all those mini-cores so it better perform, because it will cost a decent sum.
I would mention ... "but will it play crysis" but I am not sure how funny that is anymore.
Can't wait for Larrabee; hopefully a single Larrabee can have the performance of 295. Nvidia and ATI are slacking as they know they can price fixing and stop coming out with better GPU, just more cards with the same old GPU.