Feeds
90%
ATI X1900 XTX graphics card

ATI Radeon X1900 XT and XTX

The world's fastest graphics cards?

Intelligent flash storage arrays

Multi-texture fillrate

Multitexturing is bandwidth-limited as texture layers increase, hence the large lead for the GTX 512. It makes good use of 850MHz memory in this test. Even with the same ROP count, texture units and memory bandwidth as X1800 XT, X1900 XT still exhibits less performance loss, although only to the tune of 3.5 per cent.

ATI X1900 XTX graphics card

Floating-point texture bandwidth

We measure available texture bandwidth by asking the hardware to read from sequential locations in an FP16 texture, the second texel sample relying on the first, creating a dependant texture read.

ATI X1900 XTX graphics card

For some reason the hardware can't execute the texture read as fast as the R520 and the X1800 XT can, despite there being no theoretical reason other than a driver problem or issue scheduling the texture fetch. Software defeats the hardware, likely. We'll come back to that theme later.

Texture-fetch latency

In our texture-fetch test the R580 is again slightly slower than the R520 when fetching texels from a small texture. The entire texture fits nicely inside the GPU's texture cache on all three tested chips, indicating G70 has a larger texel cache bandwidth than either ATI chip.

ATI X1900 XTX graphics card

When using a texture that - even with compression - wouldn't fit inside the texture cache, ATI's high-end GPUs do better than the G70, although the R580 is still ever so slightly slower than the R520 at the same clocks.

ATI X1900 XTX graphics card

PCI Express bandwidth

As a nod to the modern GPU's ability to act prefectly well as a generally programmable parallel stream processor, and with R5-series GPUs supporting scatter writes into card memory from shader programs via an OpenGL extension, testing the PCI Express bandwidth of these high-end graphics boards when pushing data back to the GPU is prudent.

ATI X1900 XTX graphics card

The R580 and R520 have over 1000MBps of writeback bandwidth to use, given a suitable host platform. Indeed, the R580 is the first GPU, backed by nearly 50GBps of local memory bandwidth, we've tested that breaks the 1GBps barrier when squirting data back to the host.

Intelligent flash storage arrays

Next page: Verdict

More from The Register

next story
Hi-torque tank engines: EXTREME car hacking with The Register
Bentley found in a hedge gets WW2 lump insertion
Trousers down for six of the best affordable Androids
Stylish Googlephones for not-so-deep pockets
What's MISSING on Amazon Fire Phone... and why it WON'T set the world alight
You fought hard and you saved and earned. But all of it's going to burn...
Download alert: Nearly ALL top 100 Android, iOS paid apps hacked
Attack of the Clones? Yeah, but much, much scarier – report
Fujitsu CTO: We'll be 3D-printing tech execs in 15 years
Fleshy techie disses network neutrality, helmet-less motorcyclists
prev story

Whitepapers

Designing and building an open ITOA architecture
Learn about a new IT data taxonomy defined by the four data sources of IT visibility: wire, machine, agent, and synthetic data sets.
How to determine if cloud backup is right for your servers
Two key factors, technical feasibility and TCO economics, that backup and IT operations managers should consider when assessing cloud backup.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Website security in corporate America
Find out how you rank among other IT managers testing your website's vulnerabilities.