iXBT Labs - Computer Hardware in Detail







<< Previous page

     Next page >>

Direct3D 10: vertex texture fetch rate

Vertex Texture Fetch tests measure the speed of many vertex texture fetches. These tests are essentially similar, and the correlation of their results in Earth and Waves tests must also be similar. Both tests use displacement mapping based on texture fetches. The only major difference is that the Waves test uses conditional branches, while the Earth test does not.

Let's analyze the first test (Earth) in Effect detail Low mode:

Judging by our previous reviews, this test may be affected by texturing speed and by memory bandwidth. However, performance of the new card from AMD at various frequencies does not make it clear. Another candidate to be crossed out from our list of synthetic tests?

Let's not jump at conclusions, there is still a small difference between the cards. The HD 5870 is slightly slower than the GTX 285 in the easy mode, but it's faster in the heavy mode. They are generally on a par. The HD 4890 is not much slower either. Only the dual-GPU cards with AFR take the lead. Let's take a look at results of this test with more texture lookups:

The situation has changed only a little, we can see it in slightly worse results of all cards. The HD 5870 is outperformed by the dual-GPU cards in all modes and by NVIDIA GeForce GTX 285 in the easy mode. Judging by results, memory bandwidth is important, but only in the easy mode. Performance is limited by something else in other modes.

Let's have a look at results of the second vertex texture fetch test. The Waves test executes fewer texture lookups, but it uses conditional branches. The number of bilinear texture lookups in this case reaches 14 (Effect detail Low) or 24 (Effect detail High) per each vertex. Geometry complexity changes just like in the previous test.

Waves test results resemble what we saw last time. AMD products get a bigger advantage here. The HD 5870 almost catches up with the dual-GPU NVIDIA GeForce GTX 295 now, being traditionally defeated only in the easy mode. The new RADEON HD 5800 card does not outperform the prev-gen single-GPU model very much, but it still does. Let's analyze the second modification of the test:

There are almost no changes, although AMD results grow even better versus NVIDIA performance as complexity grows. GeForce GTX 285 is outperformed by the RADEON HD 5870 again. And the latter again fares on a par with the GTX 295. And only the HD 4870 X2 is somewhere far ahead. However, VTF tests in RightMark 2.0 cannot show differences between such powerful solutions anymore either. Alas, their results are practically useless now. Something must be done with this situation.

Write a comment below. No registration needed!

<< Previous page

Next page >>

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.