Nvidia GeForce GTX 960 2GB Vs 4GB Review

We have unfinished business with Nvidia's GTX 960. On launch, we lauded its power efficiency, overclocking and cutting-edge media acceleration but we had two issues: firstly, there was no clear win over the competition in terms of performance, and secondly, it was a 2GB card in a world where console-level visuals were starting to demand a 3GB minimum. However, in line with its AMD counterpart - the R9 380 - 4GB variants are now available, and we've finally acquired one.

The card in question is Gigabyte's GV-N960OC-4GD and we bought it ourselves from Amazon for £160. And that price-point is significant, because it's pretty much the same cost as many of the other GTX 960s on the market - cards that only feature the standard 2GB allocation. Which begs the question, is there any sign of obvious cost-cutting on this particular model? Well, the truth is that in direct comparison with our existing 2GB SKU - MSI's Gaming 2G model - it's actually a bit of a peach. Physically, the card is much smaller, making it a really good, cheap card for a relatively powerful small form-factor PC, yet there is no obvious increase in heat generation or fan noise. Even on an open air test bed, there's no sign of the dreaded 'coil whine'.

Build quality looks good, the card is more understated than many of its competitors, and even with its diminutive dimensions, there's no real loss of functionality. Gigabyte's model retains the SLI connectivity, and feature dual DVIs, HDMI and DisplayPort IO - probably more useful for a card in this price range than the three-way DisplayPort, DVI and HDMI set-up of our existing MSI Gaming 2G card.

Nvidia GeForce GTX 960 specs

The GTX 960 is effectively the GTX 980 halved: memory, CUDA cores, ROPs, bandwidth, RAM bus, L2 cache - they're all just 50 per cent as large as the Maxwell flagship. However, core and memory clocks remain reassuringly high, and there's still some decent overclocking headroom here. With GM206, Nvidia has full hardware encoding and decoding for the HEVC h.265 standard, along with HDMI 2.0/HDCP 2.2 support.

• CUDA Cores: 1024
• Base Clock: 1126MHz (1190MHz on the Gigabyte model, 1216MHz on MSI)
• Boost Clock: 1178MHz (variable)
• Memory: 2GB/4GB GDDR5
• Memory Clock: 7010MHz
• Memory Bandwidth: 112.16GB/s
• Texture Mapping Units 64
• ROPs: 32
• L2 Cache Size: 1048MB
• TDP: 120W
• Die Size: 227mm2
• Manufacturing Process: 28nm

The GTX 960 has retained its price-point in the face of stiff competition, typically costing £150-£160 for the 2GB model, with a £20 premium at least on the 4GB SKU. However, we picked up this 4GB model from Amazon for just £160.

In terms of power delivery, it uses the GTX 960's standard six-pin input, making it widely compatible with more power supplies than its AMD equivalent, the R9 380 (typically requiring two). The MSI card has an eight-pin input for higher power delivery, but when it came to overclocking, that really seemed to make no odds. Nvidia reckons that even on a standard cooler, the GTX 960's fully enabled GM206 processor will overclock nicely, boosting to around 1450MHz. We got the Gigabyte card up to 1475MHz vs 1500MHz on the MSI model - a difference that has no noticeable impact on real-world gaming.

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Buy the graphics cards tested on this page from Amazon with free shipping:

• Nvidia GeForce GTX 960 2GB
• Gigabyte GeForce GTX 960 4GB
• AMD Radeon R9 380 2GB
• AMD Radeon R9 380 4GB

However, at stock settings, the Gigabyte card is slower than our existing MSI example. Base clock is set at 1190MHz vs 1216MHz, and we suspect that the MSI card has more aggressive boost, resulting in slightly lower frame-rates on our new 4GB card. But there's really nothing at all to stop you dipping into your overclocking tool of choice (we recommend MSI Afterburner) and upping the core clock by, say, 50MHz and that will more than compensate. In truth, that's barely scratching the surface of what this card can do from an overclocking perspective.

So on a general level, what kind of performance can you expect from the GTX 960? When we first reviewed it, there was no knockout win in terms of its gaming throughput - and things have changed since then, and arguably, not for the better. AMD has refreshed its R9 285, essentially overclocking it and backing it with improved drivers. The result is the R9 380, which is undoubtedly the faster card.

We like to get a handle on the gaming credentials of any given GPU by running it through the Crysis 3 gameplay challenge - a run-through of the Welcome to the Jungle stage, which on high and very high presets, remains highly demanding. Our aim here is to hit 1080p at as close to a sustained 60fps as possible, matching the resolution and refresh rate of the most common type of gaming display in use today (according to the Steam hardware survey, at least).

Crysis 3 R9 380 vs GTX 960 vs R9 280 Gameplay Frame-Rate Test

Crysis 3 1080p60/V-Sync Gameplay	GTX 960	R9 380	R9 280
Lowest Frame-Rate	40fps	41fps	40fps
Dropped Frames (from 18650 total)	689 (3.7%)	539 (2.9%)	840 (4.5%)

Dropping down to the high preset to sustain 60fps as much as we can, we pit the GTX 960 against the R9 380 and our favoured card in this category (before AMD discontinued it) - the R9 280. The results demonstrate that there is the same ballpark performance, but the latest AMD card is better at preserving peak frame-rates. The GTX 960 sits in the middle, faster than the old Radeon but not quite as quick as the latest model.

Now, the R9 380 doesn't have much in the way of overclocking headroom available (1-3fps extra on seven of our eight test games at 1080p, with Tomb Raider doing best, rising by 5fps), so we were interested in revisiting GTX 960 performance on two counts. Firstly to see if the easily overclockable Nvidia card can catch up or exceed its competitor once the OC was in place, and secondly - and rather more importantly - to see the impact that 4GB of VRAM makes. On the first count, the answer is broadly positive - the GTX 960 either draws level with R9 380, or mildly exceeds it, but there's no knockout blow against the AMD counterpart. The second point is a little more complex.

The TL;DR read version is this: watch the video. Nvidia's memory management is typically more robust than its AMD counterpart, meaning that its 2GB tends to go further (look at Far Cry 4 for the best example of this). For the most part, latency spikes (stutter) where VRAM is maxed are smoothed out, producing improved performance that belies the frame-rate averages. However, there is a night and day difference with an ultra-high Assassin's Creed Unity - there's a 30 per cent boost to overall performance with a 4GB GTX 960, making the top-end experience attainable at 30fps on what is a relatively inexpensive card. Elsewhere, gains are more limited, if not non-existent. Buying a 4GB card at this point remains an insurance policy of sorts - something that pays off spectacularly occasionally, especially in sub-optimal PC ports (Batman: Arkham Knight, we're looking at you).

GeForce GTX 960/ Radeon R9 380 2GB vs 4GB 1080p Benchmarks

1920x1080 (1080p)	R9 380 2GB	R9 380 4GB	GTX 960 2GB	GTX 960 4GB	GTX 960 4GB OC
Assassin's Creed Unity, Ultra High, FXAA	32.8	37.1	26.7	34.5	39.0
Battlefield 4, Ultra, 4x MSAA	47.9	47.8	49.4	47.6	53.6
Crysis 3, Very High, SMAA T2x	50.3	49.8	47.2	46.2	51.6
Far Cry 4, Ultra, SMAA	50.7	53.8	48.1	47.2	53.1
Shadow of Mordor, Ultra, Medium Textures, FXAA	62.7	64.1	52.8	52.2	56.9
Ryse, High, SMAA	47.8	49.5	42.4	41.1	46.5
Tomb Raider, Ultimate, FXAA	69.5	70.0	66.9	65.2	72.5
The Witcher 3, High, No HairWorks, Custom AA	49.7	49.2	47.3	47.2	53.0

We can't recommend the GTX 960 or the R9 380 for high-end gameplay at 1440p - while most of the numbers below are north of the 30fps threshold, it's important to remember that they are averages. All of the games tested here with the exception of Shadow of Mordor and Tomb Raider drop into the low-20s at their lowest points - and those are the moments you'll remember most in your gameplay sessions. Bearing in mind that 2560x1440 represents a 77 per cent increase in resolution over 1080p, you're going to need some fairly aggressive settings tweaks in the downward direction to get today's demanding titles to run well at this high pixel count.

Still, the games that tested the 2GB VRAM limit first time around are even more challenging now, but mostly for the R9 380, where even dropping Assassin's Creed Unity down from ultra high to high settings still results in big wins for AMD's 4GB card compared to its 2GB version. Once again confirming that Nvidia VRAM goes further, the performance difference is much lower between the two SKUs, though 4GB remains preferable.

Just to reiterate the point, on both tables you'll note that the 4GB GTX 960 is marginally slower than the 2GB version in most cases. This is not down to the VRAM difference - it's because of the differing factory overclocks between the 2GB MSI card we had to test and the 4GB Gigabyte card. On aggregate across our eight tests, the 4GB R9 380 is around ten per cent faster than its GTX 960 counterpart, but with the overclock in place, the Nvidia card has an average 1.7 per cent uplift compared to its rival (obviously though, the R9 380 itself can be pushed beyond this, but not substantially). At 1440p, the gap widens - the R9 380 is 15 per cent faster when the 4GB cards are compared directly.

GeForce GTX 960/ Radeon R9 380 2GB vs 4GB 1440p Benchmarks

2560x1440 (1440p)	R9 380 2GB	R9 380 4GB	GTX 960 2GB	GTX 960 4GB
Assassin's Creed Unity, High, FXAA	27.3	31.4	25.2	26.2
Battlefield 4, Ultra, 4x MSAA	31.6	31.5	31.9	31.0
Crysis 3, Very High, SMAA T2x	31.6	31.3	28.3	27.7
Far Cry 4, Ultra, SMAA	36.5	39.5	33.7	32.8
Shadow of Mordor, Ultra, Medium Textures, FXAA	46.5	46.3	37.8	36.8
Ryse, High, SMAA	33.0	35.6	30.2	29.2
Tomb Raider, Ultimate, FXAA	47.7	47.7	42.2	41.2
The Witcher 3, High, No HairWorks, Custom AA	33.5	33.2	30.4	31.0

Let's round off the analysis by taking a look at power consumption and overclocking. We have a particular stress test here: the end of the Crysis 3 Welcome to the Jungle stage features an area of the level rich in geometry and bathed in performance-sapping alpha effects. It causes a spike in power consumption we've not seen in a repeatable scenario in any other game. We use this to test peak system power consumption, and also to stress-test our overclocking. The chances are you can push this card further, but we're interested not just in maximum frequencies but also in longer term stability.

We were stable with an additional 160MHz added to the core and 450MHz to the onboard GDDR5 taking us very close to a full 8000gbps of bandwidth. That's slightly lower in terms of the core compared to the MSI Gaming 2G model we tested, but had no noticeable impact on everyday gaming - we were still regularly boosting to an impressive 1475MHz. That said, this is lower than other Maxwell cards, where +200MHz to the core is usually our starting point. On average, the Gigabyte GTX 960 added 12 per cent to its performance with the overclock in place, and bearing in mind that the card remained cool and quiet with no massive spike in power draw, that's a good result.

As expected, it's good news in terms of overall power consumption - the GTX 960 is considerably more power-efficient than the R9 380, and overclocking adds a mere 22W to consumption. On an open air test-bed, GPU temperatures remained in the 60 degrees Celsius range, even with the card overclocked. Overall consumption in the stress test scenario hit a max of around 248W here. Bearing in mind we're using a Core i7 4790K processor, that's not bad at all. And we should say that this Crysis stress test really does put the card through the wringer - in our initial GTX 960 review, we used the Metro Last Light benchmark for power consumption testing and the result was almost 50W lower.

R9 380 2GB	R9 380 4GB	GTX 960 2GB	GTX 960 4GB	GTX 960 4GB OC
Peak System Power Draw	282W	279W	228W	226W	248W