iXBT Labs - Computer Hardware in Detail






i3DSpeed, August 2013

NVIDIA GeForce GTX 660 2048MB 192-bit GDDR5 (993-1053/6000 MHz)

Andrey Vorobiev; September 6, 2013

« Back to i3DSpeed

On the example of Zotac GeForce GTX 660 2048MB 192-bit GDDR5 (993-1053/6000 MHz).


  • GPU: GeForce GTX 660 (GK106)
  • Interface: PCIe 3.0 x16
  • GPU clock rate (ROPs/shaders): 993-1075/993-1075 MHz (the standard is 980-1033/980-1033 MHz)
  • Memory clock rate, physical (effective): 1500 (6000) MHz (standard)
  • Memory bus: 192-bit
  • Stream processors: 960
  • Texture units: 80 (BLF/TLF/ANIS)
  • ROP units: 24
  • Dimensions: 180x112 mm, dual-slot
  • Board color: black
  • Power consumption (3D peak/2D/idle): 141/48/25 W
  • Display connectors: Dual-Link DVI-I, Dual-Link DVI-D, HDMI 1.4a, DisplayPort 1.2
  • Multi-GPU mode: hardware SLI

This card has two 6-pin supplementary power connectors.

How does one make a graphics card with a 192-bit bus and yet with 2GB of video memory? Usually, 2048MB are provided by 8 x 2Gbit chips handled by a 256-bit bus. To use a 192-bit bus and still have 2GB video memory, one would need something like 12 memory chips of different capacity. However, in this case we see 8 x 2Gbit memory chips, yet two of the three 64-bit memory controllers work as usual, each with 2 memory chips (2 x 32-bit = 64-bit), and the third controller works with 4 memory chips (4 x 16-bit = 64-bit). This is obviously cheaper than going with 12 memory chips.

GeForce GTX 660 is based on a different GPU than GeForce GTX 660 Ti. The PCBs are different, too, so while the latter can be equipped with up to 3GB of RAM, the maximum for GeForce GTX 660 is 2GB. (A 1536MB configuration is possible with a 192-bit bus if you remove 2 of the memory chips with the halved bus width.) Anyway, Zotac tried to keep the card small and succeeded. Also, the VRM has 4 phases.

« Back to i3DSpeed

Write a comment below. No registration needed!

blog comments powered by Disqus

  Most Popular Reviews More    RSS  

AMD Phenom II X4 955, Phenom II X4 960T, Phenom II X6 1075T, and Intel Pentium G2120, Core i3-3220, Core i5-3330 Processors

Comparing old, cheap solutions from AMD with new, budget offerings from Intel.
February 1, 2013 · Processor Roundups

Inno3D GeForce GTX 670 iChill, Inno3D GeForce GTX 660 Ti Graphics Cards

A couple of mid-range adapters with original cooling systems.
January 30, 2013 · Video cards: NVIDIA GPUs

Creative Sound Blaster X-Fi Surround 5.1

An external X-Fi solution in tests.
September 9, 2008 · Sound Cards

AMD FX-8350 Processor

The first worthwhile Piledriver CPU.
September 11, 2012 · Processors: AMD

Consumed Power, Energy Consumption: Ivy Bridge vs. Sandy Bridge

Trying out the new method.
September 18, 2012 · Processors: Intel
  Latest Reviews More    RSS  

i3DSpeed, September 2013

Retested all graphics cards with the new drivers.
Oct 18, 2013 · 3Digests

i3DSpeed, August 2013

Added new benchmarks: BioShock Infinite and Metro: Last Light.
Sep 06, 2013 · 3Digests

i3DSpeed, July 2013

Added the test results of NVIDIA GeForce GTX 760 and AMD Radeon HD 7730.
Aug 05, 2013 · 3Digests

Gainward GeForce GTX 650 Ti BOOST 2GB Golden Sample Graphics Card

An excellent hybrid of GeForce GTX 650 Ti and GeForce GTX 660.
Jun 24, 2013 · Video cards: NVIDIA GPUs

i3DSpeed, May 2013

Added the test results of NVIDIA GeForce GTX 770/780.
Jun 03, 2013 · 3Digests
  Latest News More    RSS  

Platform  ·  Video  ·  Multimedia  ·  Mobile  ·  Other  ||  About us & Privacy policy  ·  Twitter  ·  Facebook

Copyright © Byrds Research & Publishing, Ltd., 1997–2011. All rights reserved.