The Sandy Bridge Preview
by Anand Lal Shimpi on August 27, 2010 2:38 PM ESTFinal Words
If Intel's roadmap and pricing hold true, then the Core i5 2400 should give you an average of 23% better performance than the Core i5 760 at a potentially lower point. If we compare shipping configurations, the Core i5 2400 should actually perform like a Core i7 880 despite not having Hyper Threading enabled. Clock for clock however, Sandy Bridge seems to offer a 10% increase in performance. Keep in mind that this analysis was done without a functional turbo mode, so the shipping Sandy Bridge CPUs should be even quicker. I'd estimate you can add another 3 - 7% to these numbers for the final chips. That's not bad at all for what amounts to a free upgrade compared to what you'd buy today. Power consumption will also see an improvement. Not only will Sandy Bridge be noticeably quicker than Lynnfield, it'll draw less power.
While Nehalem was an easy sell if you had highly threaded workloads, Sandy Bridge looks to improve performance across the board regardless of thread count. It's a key differentiator that should make Sandy Bridge an attractive upgrade to more people.
The overclocking prevention Intel is putting into Sandy Bridge sounds pretty bad at first. However if the roadmap and pricing stay their course, it looks like overclockers looking to spend as much as they did on Core i5 750/760s won't be limited at all thanks to the K SKUs in the mix. The real question is what happens at the low end. While I don't get the impression that the Core i3 2000 series will be completely locked, it's unclear how much rope Intel will give us.
Sandy Bridge's integrated graphics is good. It's fast enough to put all previous attempts at integrated graphics to shame and compete with entry level discrete GPUs. The fact that you can get Radeon HD 5450 performance for free with a Core i5 2400 is just awesome. As I mentioned before, you won't want to throw away your GTX 460, but if you were planning on spending $50 on a GPU - you may not need to with Sandy Bridge.
Assuming mobile Sandy Bridge performs at least as well as the desktop parts, we may finally be at the point where what you get with a mainstream notebook is good enough to actually play some games. I'm really curious to see how well the higher spec integrated graphics parts do once Sandy Bridge makes it a little closer to final (Update: it looks like we may have had a 12 EU part from the start). I should add that despite the GPU performance improvement - don't believe this is enough. I would like to see another doubling in integrated GPU performance before I'm really happy, but now it's very clear that Intel is taking integrated graphics seriously.
Architecturally, I'm very curious to see what Intel has done with Sandy Bridge. Given the improvements in FP performance and what I've heard about general purpose performance, I'm thinking there's a lot more than we've seen here today. Then there are the features that we were unable to test: Sandy Bridge's improved turbo and its alleged on-die video transcode engine. If the latter is as capable as I've heard, you may be able to have better transcoding performance on your notebook than you do on your desktop today. Update: Check out our Sandy Bridge Architecture article for full details on the CPU's architecture.
With Sandy Bridge next year you'll get higher clock speeds, more performance per clock and reasonable integrated graphics at presumably the same prices we're paying today. What's even more exciting is the fact that what we're looking at is just mainstream performance. The high end Sandy Bridge parts don't arrive until the second half of 2011 which add more cores and more memory bandwidth.
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gruffi - Friday, August 27, 2010 - link
Why not comparing with a HD 5570? That is what Llano is supposed to have, Redwood-class IGP. An HD 5450 is quite pointless. It just reflects competition for Ontario. But Sandy Bridge is not Ontario's competition.And what about image quality or GPGPU support? Pure FPS numbers are only half of the truth.
wiak - Friday, August 27, 2010 - link
dont think so, its said that AMD's Fusion built-in GPU will have 400 SPUs (HD 5670 level-graphics), thats a far cry from HD 5450's 80 SPUs ;)so if you wanna game you still have to use something from a real graphics manufacture like AMD when it comes to GPUs bult into CPUs, as a added bonus you also have updated drivers and a decade old DirectX 9 compatibility, so you old games work without any big problems
icrf - Friday, August 27, 2010 - link
I am impressed that you have a functioning sample at least four months before it's available, run it through enough paces for a review like this, and they let you release the numbers. I mean, are they trying to suppress holiday sales?When do you think you'll have a Bulldozer sample from AMD to run a similar preview? Barring a surprise from AMD, at this point, it looks like I'll be building an i7 2600 early next year. The similar spec chip from today is an i7-975 Extreme, which is the fastest quad core in the bench, and Sandy Bridge runs 13-14% faster in the only benchmark I care about (x264). I guess even that might change significantly if it can take advantage of this "alleged on-die video transcode engine." I'd not heard of that before.
Anand Lal Shimpi - Friday, August 27, 2010 - link
Honestly we're probably several months out from having Bulldozer silicon in a similar state. With the past few generations of Intel CPUs, by around 4 - 6 months before launch we're usually able to get access to them and they perform very well.With AMD the lead time is far shorter. I don't expect us to have access to Bulldozer silicon that's worth benchmarking until Q2 2011 at the earliest. I'm more than happy to be proven wrong though :-P
icrf - Friday, August 27, 2010 - link
I guess I'm mostly surprised that Intel would do it. Conroe made sense. They had to show the world as early as possible that they had something significantly faster than AMD, suppressing sales of that for their own a little later. But now that they own that performance crown, why show previews so many months early? I suppose I could be over-analyzing it and the vast majority of the market couldn't care less so it makes little difference to their bottom line. Bragging rights simply make for good PR.Sad to see Bulldozer so far out. I assume the server chips will ship before the consumer ones, too, so it'll be at least a solid year before it could be in my hands, anyway. Oh well. To be honest, my C2D E6400 still does well enough for me. Maybe I'll just make my upgrade an Intel G3 SSD. If I got both that and SB, I don't know what I'd do with myself.
Thanks, and keep up the good work.
Anand Lal Shimpi - Saturday, August 28, 2010 - link
This preview wasn't Intel sanctioned, I believe Intel will release its own numbers at IDF in a few weeks.Take care,
Anand
icrf - Saturday, August 28, 2010 - link
Oh, I had assumed you got this chip from Intel and they had a typical NDA that said when you could talk about what you found. Where'd it come from, then? One of Intel's motherboard partners with whom you have a friendly relationship?aegisofrime - Saturday, August 28, 2010 - link
I must say, I'm really grateful for this article. I'm in the middle of planning an upgrade and information like this is really valuable to me. (and I guess to a lot of people as well!) I would just like you to know that your articles actually do influence some of our buying choices. So... Thank you! :DNow, all I need is a Bulldozer preview and all the pieces are in place...
vajm1234 - Friday, August 27, 2010 - link
few things clear and few unclear as of nowthis sandy bridge review sample here do not have TURBO enabled. The CPU runs at 3.1GHz all the time, regardless of workload as anand stated
it says "Both the CPU and GPU on SB will be able to turbo independently of one another. If you’re playing a game that uses more GPU than CPU, the CPU may run at stock speed (or lower) and the GPU can use the additional thermal headroom to clock up. The same applies in reverse if you’re running something computationally intensive."
QUESTIONS
Q} will the on die GPU unit work in tandem with the other discrete GPUs out there or it will shut off? if yes will it work when sli or crossfire is enabled :p
Q} whatever the above statement says will it happen if we use discrete graphics from nvidia or ati?
Q} will there be any possibility to disable ONLY GPU and in certain cases ONLY its TURBO FEATURE
Q} any possibility to remain the GPU overclocked the whole time when cpu is IDLE
Q} what about accelerated hd video playback using the on die gpu?
Q} it support VT-x and AVX is it possible for you anand to use specific benchmark for these instructions, same request goes for the AMD
Q} as someone asked will there be a cheap 6 => core processor for mainstream market
Q} again as per the last comment ......When do you think you'll have a Bulldozer sample from AMD to run a similar preview?
this Ques Must be answered
all n all what i think even if there is a 15-19% perf. Jump its not worh the spending when u consider u have to upgrade the entire platform
and moreover limiting Overclocking features damm! a retarded decision i am not in a mood for amd but if the overclocking hits then i will move 10000...% :angry:
regards
DanNeely - Saturday, August 28, 2010 - link
If you're asking about an SLI/CFX pairing with the IGP almost certainly not. The only company to ever attempt something like that has been Lucid with the Hydra chip and the results have been less than impressive. Architecturally I don't know that it'd even be possible for them to try with the on die GPU. The Hydra chip sat between the CPU and the Gfx cards on the PCIe bus and looked like a single card to the OS. There's no way for them to insert themselves into the middle of the connection to the IGP.