The NVIDIA GeForce GTX 750 Ti and GTX 750 Review: Maxwell Makes Its Moveby Ryan Smith & Ganesh T S on February 18, 2014 9:00 AM EST
As the GPU company who’s arguably more transparent about their long-term product plans, NVIDIA still manages to surprise us time and time again. Case in point, we have known since 2012 that NVIDIA’s follow-up architecture to Kepler would be Maxwell, but it’s only more recently that we’ve begun to understand the complete significance of Maxwell to the company’s plans. Each and every generation of GPUs brings with it an important mix of improvements, new features, and enhanced performance; but fundamental shifts are fewer and far between. So when we found out Maxwell would be one of those fundamental shifts, it changed our perspective and expectations significantly.
What is that fundamental shift? As we found out back at NVIDIA’s CES 2014 press conference, Maxwell is the first NVIDIA GPU that started out as a “mobile first” design, marking a significant change in NVIDIA’s product design philosophy. The days of designing a flagship GPU and scaling down already came to an end with Kepler, when NVIDIA designed GK104 before GK110. But NVIDIA still designed a desktop GPU first, with mobile and SoC-class designs following. However beginning with Maxwell that entire philosophy has come to an end, and as NVIDIA has chosen to embrace power efficiency and mobile-friendly designs as the foundation of their GPU architectures, this has led to them going mobile first on Maxwell. With Maxwell NVIDIA has made the complete transition from top to bottom, and are now designing GPUs bottom-up instead of top-down.
Nevertheless, a mobile first design is not the same as a mobile first build strategy. NVIDIA has yet to ship a Kepler based SoC, let alone putting a Maxwell based SoC on their roadmaps. At least for the foreseeable future discrete GPUs are going to remain as the first products on any new architecture. So while the underlying architecture may be more mobile-friendly than what we’ve seen in the past, what hasn’t changed is that NVIDIA is still getting the ball rolling for a new architecture with relatively big and powerful GPUs.
This brings us to the present, and the world of desktop video cards. Just less than 2 years since the launch of the first Kepler part, the GK104 based GeForce GTX 680, NVIDIA is back and ready to launch their next generation of GPUs as based on the Maxwell architecture.
No two GPU launches are alike – Maxwell’s launch won’t be any more like Kepler’s than Kepler was Fermi’s – but the launch of Maxwell is going to be an even greater shift than usual. Maxwell’s mobile-first design aside, Maxwell also comes at a time of stagnation on the manufacturing side of the equation. Traditionally we’d see a new manufacturing node ready from TSMC to align with the new architecture, but just as with the situation faced by AMD in the launch of their GCN 1.1 based Hawaii GPUs, NVIDIA will be making do on the 28nm node for Maxwell’s launch. The lack of a new node means that NVIDIA would either have to wait until the next node is ready, or launch on the existing node, and in the case of Maxwell NVIDIA has opted for the latter.
As a consequence of staying on 28nm the optimal strategy for releasing GPUs has changed for NVIDIA. From a performance perspective the biggest improvements still come from the node shrink and the resulting increase in transistor density and reduced power consumption. But there is still room for maneuvering within the 28nm node and to improve power and density within a design without changing the node itself. Maxwell in turn is just such a design, further optimizing the efficiency of NVIDIA’s designs within the confines of the 28nm node.
With the Maxwell architecture in hand and its 28nm optimizations in place, the final piece of the puzzle is deciding where to launch first. Thanks to the embarrassingly parallel nature of graphics and 3D rendering, at every tier of GPU – from SoC to Tesla – GPUs are fundamentally power limited. Their performance is constrained by the amount of power needed to achieve a given level of performance, whether it’s limiting clockspeed ramp-ups or just building out a wider GPU with more transistors to flip. But this is especially true in the world of SoCs and mobile discrete GPUs, where battery capacity and space limitations put a very hard cap on power consumption.
As a result, not unlike the mobile first strategy NVIDIA used in designing the architecture, when it comes to building their first Maxwell GPU NVIDIA is starting from the bottom. The bulk of NVIDIA’s GPU shipments have been smaller, cheaper, and less power hungry chips like GK107, which for the last two years has formed the backbone of NVIDIA’s mobile offerings, NVIDIA’s cloud server offerings, and of course NVIDIA’s mainstream desktop offerings. So when it came time to roll out Maxwell and its highly optimized 28nm design, there was no better and more effective place for NVIDIA to start than with the successor to GK107: the Maxwell based GM107.
Over the coming months we’ll see GM107 in a number of different products. Its destiny in the mobile space is all but set in stone as the successor to the highly successful GK107, and NVIDIA’s GRID products practically beg for greater efficiency. But for today we’ll be starting on the desktop with the launch of NVIDIA’s latest desktop video cards: GeForce GTX 750 Ti and GeForce GTX 750.
Post Your CommentPlease log in or sign up to comment.
View All Comments
Harry Lloyd - Tuesday, February 18, 2014 - link20 nm Maxwell will be epic. Gimme.
TheinsanegamerN - Tuesday, February 18, 2014 - linkImagine. OCed Geforce 690 level performance, out of a single chip, with 8 GB of RAM on a 512 bit bus, pulling the same amount of power as a geforce 770. One can dream....
ddriver - Tuesday, February 18, 2014 - linkLOL, epic? Crippling FP64 performance further from 1/24 to 1/32 - looks like yet another nvidia architecture I'll be skipping due to abysmal compute performance per $ ratio...
JDG1980 - Tuesday, February 18, 2014 - linkThis card is designed for gaming and HTPC. Only a tiny fraction of users need FP64.
nathanddrews - Tuesday, February 18, 2014 - linkSo I guess we'll have to wait for the 750TIB before we can see SLI benchmarks. Two of these would be within reach of 770 while using considerably less power. Hypothetically, that is.
ddriver - Tuesday, February 18, 2014 - linkYou do realize the high end GPUs on the same architecture will have the same limitation?
Morawka - Tuesday, February 18, 2014 - linkI thought the higher end Maxwell cards will have Denver/aRM cores on the PCB as well.
Mr Perfect - Wednesday, February 19, 2014 - linkIt might be a software/firmware limitation though. From what the compute enthusiasts have said, the only difference between the Titan's full compute and 780Ti's cut down compute is firmware based. They've got the same chip underneath, and some people hack their 780s for full compute. They're probably doing the same thing with the Maxwell stack.
chrnochime - Wednesday, February 19, 2014 - linkGot link for the hack? Sounds interesting.
Mr Perfect - Thursday, February 20, 2014 - linkI don't myself, but if you're interested look up IvanIvanovich over at bit-tech.net. He was talking about vbios mods and resistor replacement tweaks that can do that.