Barkerwoo:Surely there must be some difference?
Another online review site did some very extensive objective testing using a range of cables from different manufacturers. IIRC some of the cables retailed at over $1000. They also compared different lengths using five bandwidth test levels i.e.742.5(Mb/s),1.65Gb/s, 2.23Gb/s, 3.4Gb/s and 4.98Gb/s in addition to real world observation. It was interesting that some of the lower cost cables passed certain tests at certain lengths whilst some expensive cables failed the same test at that length. Price is not a good measure or guarantee of a HDMI cables performance.
The review was very detailed with regard to cables specification and testing. The reviews made no silly claims about better colour, smother motion etc that some of the less credible rags claim.
"This is the equipment they used to objectively test the cables
- Tektronix DSA 8200 Digital Serial Analyzer,
- 2 x Tektronix 80E04 TDT/TDR Sampling Modules,
- Anritsu MP1763C-1 Pulse Pattern Generator,
- Digital Serial Waveform Analysis Software,
- HDMI Test Fixture Calibration Kit,
- 2 x HDMI Test Fixture TPA-R adaptors,
- 4 x 20" RF Coaxial test cables with SMA connectors,
- 2 x 36" RF Coaxial test cables with SMA connectors,
- 18 x Precision SMA 75-ohm Terminations,
- Agilent GPIB/USB Interface,
Grand Total =
$205,500 (not including the laptop to run the software)"
"Your take-away from all this should be the following:
At lengths less than 4 meters you can just about use silly string (OK, not really) and get HDMI to pass at any current resolution. At less than 3 meters you'll even extend that to 12-bit color and possibly the next crazy idea HDMI Licensing decides to throw at consumers. Don't spend a lot on these cables and if you want to save money you won't let anyone at a big box store talk you into buying from them.
At long lengths (over 10 meters) you really need to pay attention to the manufacturer if you don't want to risk running into potential problems with 1080p and future formats such as Deep Color. With that said, just about any cable at or under 10 meters will pass 720p/1080i and nearly everyone will pass 1080p at 8-bit color as well.
If you have an existing HDMI cable and are running into problems, we'd suggest at least attempting the insertion of an active component at the sink (display) side. This is going to be far cheaper than ripping out your walls and re-running new cables - and likely just as effective.
HDMI has proven to be a moving target and there is no telling what crazy (likely unnecessary) format they will try to push down the cable next. Due to this, it's always good to "overbuild" your cable install, especially if it's a longer distance and going to end up behind drywall.
If you're not prone to upgraditis and think 1080p will be your maximum resolution for the life of your install, don't sweat it...
There are going to be exceptions to all these "rules" but in the end I'd have to say that I really thought I'd see more differences in the real-world performances of longer-length cables."
Dasp