iXBT Labs - Computer Hardware in Detail






Latest News

 « Previous Day News Archive  

OCZ Technology announces 1GB unbuffered DDR400 SDRAM DIMM modules made using ULN2 technology

OCZ Technology officially announced the new 1GB unbuffered PC3200 (OCZ4001024PF) modules that will be shipped in 2GB memory kits (OCZ4002048PFDC-K). Each module in such kit has overclockers traditional aluminium heatsinks and, according to the company, at 2.6V operates at 3-3-3-7 timings. From other similar products these modules differ by the ULN2 technology.

As usual OCZ tested kit modules in couples on ASUS P4C800 motherboard. I suppose that, having announced ULN2 technology in mid-February, the company will "repeatedly" release most of its products using this innovation.

Let me provide an explanation of ULN2 for those who haven´t found it yet. I guess the best will be the explanation from Eric Nelson published at TheTechZone (thanks Eric and Moto!).

"Noise and interference in electronic circuits are unintended fluctuations in the electrical signals present in these circuits caused by other signals in the neighborhood.

Figure 1a: Conceptual graph showing light influence of noise on a signal

As an example, the ideal signal should look like Signal A, in Figure 1a. However, in reality noise and interference cause the waveform to instead appear as Signal B in Figure 1a, due to the noise stemming from Signal C running on a neighboring line. Noise in electrical circuits is also commonly known as "crosstalk" where seemingly unconnected elements within any given system can still influence, or "talk" to, each other.

Figure 1b: Conceptual graph showing heavy noise influence on a signal

The red "threshold" line in Figure 1b represents the crossover value (sometimes called the reference) that delineates whether a signal is a positive or negative value. As shown in the graph, excessive noise can change the signal integrity in that what is supposed to be a sustained positive signal can be interpreted as a rapid switching between positive and negative data and vice versa. Noise can cause a delay of the real signal and can also cause the signal to ramp up and terminate early. Both scenarios are equally bad, especially in parallel buses like the memory bus."

Therefore OCZ had to develop its own "shielded" PCB technology that reduces noises in the main signal and inductive disturbances and also improves signal routing for the maximum module clock speed.

 « Previous Day News Archive  

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.