Addressing the Memory Bandwidth Problem

Integrated graphics solutions always bumped into a glass ceiling because they lacked the high-speed memory interfaces of their discrete counterparts. As Haswell is predominantly a mobile focused architecture, designed to span the gamut from 10W to 84W TDPs, relying on a power-hungry high-speed external memory interface wasn’t going to cut it. Intel’s solution to the problem, like most of Intel’s solutions, involves custom silicon. As a owner of several bleeding edge foundries, would you expect anything less?

As we’ve been talking about for a while now, the highest end Haswell graphics configuration includes 128MB of eDRAM on-package. The eDRAM itself is a custom design by Intel and it’s built on a variant of Intel’s P1271 22nm SoC process (not P1270, the CPU process). Intel needed a set of low leakage 22nm transistors rather than the ability to drive very high frequencies which is why it’s using the mobile SoC 22nm process variant here.

Despite its name, the eDRAM silicon is actually separate from the main microprocessor die - it’s simply housed on the same package. Intel’s reasoning here is obvious. By making Crystalwell (the codename for the eDRAM silicon) a discrete die, it’s easier to respond to changes in demand. If Crystalwell demand is lower than expected, Intel still has a lot of quad-core GT3 Haswell die that it can sell and vice versa.

Crystalwell Architecture

Unlike previous eDRAM implementations in game consoles, Crystalwell is true 4th level cache in the memory hierarchy. It acts as a victim buffer to the L3 cache, meaning anything evicted from L3 cache immediately goes into the L4 cache. Both CPU and GPU requests are cached. The cache can dynamically allocate its partitioning between CPU and GPU use. If you don’t use the GPU at all (e.g. discrete GPU installed), Crystalwell will still work on caching CPU requests. That’s right, Haswell CPUs equipped with Crystalwell effectively have a 128MB L4 cache.

Intel isn’t providing much detail on the connection to Crystalwell other than to say that it’s a narrow, double-pumped serial interface capable of delivering 50GB/s bi-directional bandwidth (100GB/s aggregate). Access latency after a miss in the L3 cache is 30 - 32ns, nicely in between an L3 and main memory access.

The eDRAM clock tops out at 1.6GHz.

There’s only a single size of eDRAM offered this generation: 128MB. Since it’s a cache and not a buffer (and a giant one at that), Intel found that hit rate rarely dropped below 95%. It turns out that for current workloads, Intel didn’t see much benefit beyond a 32MB eDRAM however it wanted the design to be future proof. Intel doubled the size to deal with any increases in game complexity, and doubled it again just to be sure. I believe the exact wording Intel’s Tom Piazza used during his explanation of why 128MB was “go big or go home”. It’s very rare that we see Intel be so liberal with die area, which makes me think this 128MB design is going to stick around for a while.

The 32MB number is particularly interesting because it’s the same number Microsoft arrived at for the embedded SRAM on the Xbox One silicon. If you felt that I was hinting heavily at the Xbox One being ok if its eSRAM was indeed a cache, this is why. I’d also like to point out the difference in future proofing between the two designs.

The Crystalwell enabled graphics driver can choose to keep certain things out of the eDRAM. The frame buffer isn’t stored in eDRAM for example.

Peak Theoretical Memory Bandwidth
  Memory Interface Memory Frequency Peak Theoretical Bandwidth
Intel Iris Pro 5200 128-bit DDR3 + eDRAM 1600MHz + 1600MHz eDRAM 25.6GB/s + 50GB/s eDRAM (bidirectional)
NVIDIA GeForce GT 650M 128-bit GDDR5 5016MHz 80.3 GB/s
Intel HD 5100/4600/4000 128-bit DDR3 1600MHz 25.6GB/s
Apple A6X 128-bit LPDDR2 1066MHz 17.1 GB/s

Intel claims that it would take a 100 - 130GB/s GDDR memory interface to deliver similar effective performance to Crystalwell since the latter is a cache. Accessing the same data (e.g. texture reads) over and over again is greatly benefitted by having a large L4 cache on package.

I get the impression that the plan might be to keep the eDRAM on a n-1 process going forward. When Intel moves to 14nm with Broadwell, it’s entirely possible that Crystalwell will remain at 22nm. Doing so would help Intel put older fabs to use, especially if there’s no need for a near term increase in eDRAM size. I asked about the potential to integrate eDRAM on-die, but was told that it’s far too early for that discussion. Given the size of the 128MB eDRAM on 22nm (~84mm^2), I can understand why. Intel did float an interesting idea by me though. In the future it could integrate 16 - 32MB of eDRAM on-die for specific use cases (e.g. storing the frame buffer).

Intel settled on eDRAM because of its high bandwidth and low power characteristics. According to Intel, Crystalwell’s bandwidth curve is very flat - far more workload independent than GDDR5. The power consumption also sounds very good. At idle, simply refreshing whatever data is stored within, the Crystalwell die will consume between 0.5W and 1W. Under load, operating at full bandwidth, the power usage is 3.5 - 4.5W. The idle figures might sound a bit high, but do keep in mind that since Crystalwell caches both CPU and GPU memory it’s entirely possible to shut off the main memory controller and operate completely on-package depending on the workload. At the same time, I suspect there’s room for future power improvements especially as Crystalwell (or a lower power derivative) heads towards ultra mobile silicon.

Crystalwell is tracked by Haswell’s PCU (Power Control Unit) just like the CPU cores, GPU, L3 cache, etc... Paying attention to thermals, workload and even eDRAM hit rate, the PCU can shift power budget between the CPU, GPU and eDRAM.

Crystalwell is only offered alongside quad-core GT3 Haswell. Unlike previous generations of Intel graphics, high-end socketed desktop parts do not get Crystalwell. Only mobile H-SKUs and desktop (BGA-only) R-SKUs have Crystalwell at this point. Given the potential use as a very large CPU cache, it’s a bit insane that Intel won’t even offer a single K-series SKU with Crystalwell on-board.

As for why lower end parts don’t get it, they simply don’t have high enough memory bandwidth demands - particularly in GT1/GT2 graphics configurations. According to Intel, once you get to about 18W then GT3e starts to make sense but you run into die size constraints there. An Ultrabook SKU with Crystalwell would make a ton of sense, but given where Ultrabooks are headed (price-wise) I’m not sure Intel could get any takers.

Haswell GPU Architecture & Iris Pro The Core i7-4950HQ Mobile CRB
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  • arjunp2085 - Sunday, June 02, 2013 - link

    I was under the impression that Richland has been selling on newegg as per a comment on an earlier article..

    I was also wondering since you had done a review on Richland from MSI notebook review i was wondering if you would do a similar comparison..

    http://www.anandtech.com/show/6949/msi-gx70-3be-ri...

    It would be appreciated just placing all the possible matches on the table and a paragraph with selection criteria for the review making the choices dispelling opinion of missing any models
    Reply
  • GameHopper - Sunday, June 02, 2013 - link

    Why no real power measurements? If it's so important to iris Pro, real world power numbers will be more useful than just listing TDP of the parts Reply
  • shinkueagle - Sunday, June 02, 2013 - link

    The GIANT has awoken! Performance-wise, its amazing! Destroys Trinity! Price-wise.... Well, the area needs some work... Reply
  • trip1ex - Sunday, June 02, 2013 - link

    Yes really disappointed there is no socketed cpu solution that have the best igpu config.

    But I suppose I already have Ivy Bridge i5 for my WMC pc and it is good enough. Still be a nice cheap way to build a secondary small desktop that could also do some light gaming.
    Reply
  • Lataa - Sunday, June 02, 2013 - link

    dikicha23@gmail.com Reply
  • vFunct - Sunday, June 02, 2013 - link

    Curious why Intel just doesn't go straight for the jugular and release a discrete GPU part on their 22nm process. NVidia/AMD is stuck at 28mm because of their foundries, and it appears Intel's GPU architecture is feature complete and therefore competitive with the discrete parts if they scaled up everything by 4x or 5x.

    NVidia & AMD should be worried about their core high-profit-margins business!
    Reply
  • jamescox - Sunday, June 02, 2013 - link

    The photo you have on page 4 showing the 2 separate die is strange. The haswell die should not be square. Other photos I have seen show the expected (extremely rectangular) haswell die and a tiny ram chip. I would expect a haswell based chip with double the cpu (8 real cores), and no gpu eventually; this would be almost square. Do you know why your chip does not match other multi-chip module photos online? Reply
  • jamescox - Tuesday, June 04, 2013 - link

    I guess the other photos are haswell plus an integrated chipset in the same module. The photo of the two die is still strange, as neither of these look like a haswell die. Reply
  • IntelUser2000 - Tuesday, June 04, 2013 - link

    That's because that's the picture for GT3e Iris Pro 5200 graphics. The bigger square die is the Haswell CPU+GT3 GPU, while the smaller one is the on-package DRAM.

    The dual core with on-package chipset is even longer than the regular Haswell.
    Reply
  • TheJian - Sunday, June 02, 2013 - link

    This is useless at anything above 1366x768 for games (and even that is questionable as I don't think you were posting minimum fps here). It will also be facing richland shortly not AMD's aging trinity. And the claims of catching a 650M...ROFL. Whatever Intel. I wouldn't touch a device today with less than 1600x900 and want to be able to output it to at least a 1080p when in house (if not higher, 22in or 24in). Discrete is here to stay clearly. I have an Dell i9300 (Geforce 6800) from ~2005 that is more potent and runs 1600x900 stuff fine, I think it has 256MB of memory. My dad has an i9200 (radeon 9700pro with 128mb I think) that this IRIS would have trouble with. Intel has a ways to go before they can claim to take out even the low-end discrete cards. You are NOT going to game on this crap and enjoy it never mind trying to use HDMI/DVI out to a higher res monitor at home. Good for perhaps the NICHE road warrior market, not much more.

    But hey, at least it plays quite a bit of the GOG games catalog now...LOL. Icewind Dale and Baldur's gate should run fine :)
    Reply

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