Review (Galaxy) NVIDIA GeForce GTX 550 Ti: The Cheapest GTX 500 a Gamer Can Get

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March 17, 2011

The GTX 560 Ti might’ve stolen the spotlight in the performance-mainstream segment, but there are still people who just couldn’t justify the purchase of a GTX 560 Ti. There are many reasons for this, but the primary one is most likely limited budget, which is why NVIDIA released a cheaper variant of that GPU and calls it the GTX 550. Based on the GF116 chip, the GTX 550 Ti targets budget gamers who want to play modern titles without draining their wallet. It’s also meant as a direct replacement for its predecessor, the GTS 450. This means that the GTX 550 Ti goes head-on against Radeon HD 5770 from AMD.

With a lowest on-line price of US$ 149, the GTX 550 Ti is surely more affordable than its bigger brother, the GTX 560 Ti. How does it stack up against the competition? Could it prove to be a tough opponent for the HD 5770 just like the GTS 450 was to the HD 5750?

NVIDIA GeForce GTX 550 Ti

Reference Card

Before moving on to the specification table, let’s see how a reference GTX 550 TI board looks like. Here it is:

nvidia gtx 550 ti

The reference GTX 550 Ti is almost indistinguishable from the GTX 560 Ti due to their similar HSF design. One of the most obvious differences is the absence of side-ventilation holes on the cooler’s body of the former. The standard GTX 550 Ti card measures 8,5 inches long, with standard output display selection consisting of two DVI connectors and one mini-HDMI port.

Specification

NVIDIA GTX 570NVIDIA GTX 560 TiNVIDIA GTX 550 TiNVIDIA GTS 450
Streaming Multiprocessors15844
Stream Processors (CUDA Cores)480384192192
Texture Units60643232
ROP Units40322416
Graphics Clock732 MHz822 MHz900 MHz783 MHz
Shader Clock1464 MHz1644 MHz1800 MHz1566 MHz
Memory Clock (effective)3800 MHz4008 MHz4104 MHz3608 MHz
Memory Size1280 MB1024 MB1024 MB1024 MB
Memory TypeGDDR5GDDR5GDDR5GDDR5
Memory Interface320-bit256-bit192-bit128-bit
CodenameGF110GF114GF116GF106
Fabrication Process40 nm40 nm40 nm40 nm
Transistor Count3 Billion1.95 Billion1.17 Billion1.17 Billion
Die Size520 mm²228 mm²228 mm²
Power Connectors2x 6-pin2x 6-pin6-pin6-pin
Min Recommended Power Supply550 Watts500 Watts400 Watts400 Watts
Thermal Design Power (TDP)219 Watts170 Watts116 Watts106 Watts
GPU Thermal Threshold97 °C100 °C95 °C100 °C
DirectX Version11111111
Bus SupportPCIe 2.0 x16PCIe 2.0 x16PCIe 2.0 x16PCIe 2.0 x16

Specs wise, the GTX 550 Ti looks similar to the GTX 450. There are some notable differences though, such as the operating frequencies and amount of available ROPs.

galaxy nvidia gtx 550 ti core

The GTX 550 Ti’s new GF116 chip is based on the Fermi architecture. Just like the GF110 and GF114 that represent some degree of improvements over the GF100 and GF104 respectively, the GF116 is an improved version of the GF106 (GTS 450). NVIDIA has carried out optimizations down at the transistor level that gave the GF116 a better performance/ watt ratio than compared to its GF106 predecessor.
This optimization results in, among others, increased operating frequencies on the GTX 550 Ti. Aside from that, the number of ROPs is also increased to 24, from 16 on the GTS 450. Another improvement is made on the memory bandwidth, which is increased to 192-bit.

Mixed Density Memory

The GeForce GTX 550 Ti is equipped with three, 64-bit memory controllers, resulting in a total amount of 192-bit of memory bandwidth. The GTX 550Ti is also able to handle different memory capacities using the same set of controllers.

galaxy nvidia gtx 550 ti mix density frame buffer

As seen in the diagram above, each memory controller can be used to handle different memory amounts. In this example, two controllers handle 256 MB of memory each, while the third one has 512 MB of RAM allocated to it. One of the key advantages of this scheme is that the graphics card could handle 1 GB of on-board memory using 192-bit memory controllers, something that is not conceivable with previous-generation graphics card since the 192-bit bandwidth would be limited to 768 MB of memory (3x 256MB,with each controller handing the same amount of RAM).
With older generation cards (that use the same set of 3x 64-bit controllers), NVIDIA’s AIB partners could have easily increase the amount of on-board memory on their GeForce products to 1,5 GB by allocating the same amount of memory to each 64bit-controller (3x 512MB), or increase the bandwidth to 256-bit to allow the corresponding graphics card to handle 1 GB of memory (4x 256 MB) if they want to upgrade the standard 768-MB configuration. However, such move would increase the production cost and severely affect the pricing of the final product. This is no longer the case with GTX 550 Ti because each controller is able to handle different memory amount, giving manufacturers more flexibility to put different sizes of on-board memories on their products.

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