Author Archive
The trouble with 802.11 Wireless-N
Posted by Ivan Bohannon in Wireless Networking on April 15th, 2010
(Ed: This was originally written in 2009 when I was reviewing the WNR 3500)
As I finish up the third day of frustrating testing with the Netgear WNR 3500 Wireless-N Gigabit router, I’ve come to a simple realization: There just aren’t enough channels at 2.4 Ghz to make 300 Mbps wireless N work. Read the rest of this entry »
DIY 16 core workstation part 3: Memory & Heatsinks
Posted by Ivan Bohannon in Computer Builds on March 18th, 2009
Kingston 1GB DDR2 ECC REG.
It was a little tricky finding the right memory for the Tyan S4980 motherboard. You have to make sure that you use ECC, Registered DDR2 DIMMs 400, 533 or 667 Mhz. If you buy memory that doesn’t say ECC and REGISTERED on the box it won’t work. You can use 1GB, 2GB or 4gB DIMMs, and you MUST install at least 2 DIMMs per CPU. Here’s a few part numbers I know work in the motherboard:
Heatsinks:
You have lots of options here, and a few snags. Since the CPU’s are spaced fairly close to each other, you will need compact ones. The 2U case fan cooled heat sinks fit nicely. The snag: there are 4″ and 3.5″ pitch versions. This is basically how far apart the mounting screws are spaced. The Tyan S4980 motherboard needs the 3.5″ pitch ones. See all figured out for you! Here are some good choices.
1. Dynatron F558 77mm 2 Ball CPU Cooler – Retail – $32.99
This CPU cooler comes with an unnecessary CPU support plate – the S4980 comes with them pre-installed. This is the one I purchased. Its noisy at full speed. This one won’t work in 2U cases.
2. Dynatron F661 60mm 2xBall CPU Cooler $24
This CPU is quieter on paper, doesn’t come with the CPU support plate, and its $9 cheaper. I should have bought this one. This one does work in 2U cases.
DIY 16 core workstation part 2: Processors
Posted by Ivan Bohannon in Computer Builds on March 18th, 2009
AMD Opteron 8347
As you read in part 1, we are building an AMD 16 core workstation, so we need to find four Opteron quad core processors.
Our Tyan S4980 motherboard only supports AMD “Barcelona” Opterons. Barcelona’s have two main product lines: the 23XX and 83XX. We want to avoid the 23XX for this build, because those quad core CPUs only support two in a single motherboard. Nice little hitch to avoid.
Note: AMD is now shipping “Shanghai” Opterons. These processors are faster, better (more expensive) and they don’t work in the Tyan S4980 motherboard we are using. Unfortunately, the Shanghai Opterons have the same 23XX and 83XX numbering scheme, so one more little caveat to be aware of.
8347 (1.9Ghz), 8350 (2 Ghz), 8354 (2.2 Ghz) , 8356 (2.4 Ghz) , 8358 (2.5 Ghz) , 8360 (2.6 Ghz).
There are also two high efficiency versions (these use 55W instead of 75W) of these chips which work just fine: 8346 HE (1.8 Ghz) and the 8347 HE (1.9 Ghz) . I used four 8347 HE in my build.
The least expensive Quad core opteron on New Egg is the 8346 HE. it runs $549 for the OEM packaging, which does NOT include any cooling.
Another option is to shop eBay for these cpu’s, you can find them for much less, but make sure to buy the right part numbers.
Oh before I forget..One last detail, make sure to use four identical CPUs. I don’t know if you can mix 8347 and 8347HE on the same motherboard. Good Luck!
D-Link DIR628 RangeBooster N Dual Band Router
Posted by Ivan Bohannon in Wireless Networking on March 18th, 2009
Frys had this wireless-n router on sale for $69 the other day. Great price. I bought two in hopes of being able to use one of them as a repeater to create a larger wireless network. For the record, this product doesn’t support that. Oh I tried to use the D-Link Quick Router Setup CD, it repeatedly crashes in nmrsbase.exe. I googled this filename and its the Network Magic setup app, D-Link must rebrand this application. The manual browser setup works fine. I really despise installation CDs.
DIY 16 core workstation part 1: The motherboard
Posted by Ivan Bohannon in Computer Builds on February 17th, 2009
TYAN S4980G2NR
I love virtual machines. Unfortunately running lots of them on one server can get very expensive. A 16-core Dell PowerEdge R905 for example, will set you back about 12 grand (without OS). So I set out to try and build my own system for less – and I’ve succeeded!
About a month ago I was doing random motherboard searches on NewEgg and I found exactly ONE quad socket motherboard for sale: the TYAN S4980G2NR Quad 1207(F) NVIDIA nForce Professional 3600 Extended ATX Server Motherboard.
The only catch (for me) was that this motherboard used AMD Opteron cpus, and I knew nothing about them. But there are no Xeon quad socket motherboards readily available, so AMD it is. Theres alot of backstory on the Opteron / Xeon battle for market domination, but really it doesn’t matter if you can’t find quad socket Intel Xeon motherboards. So AMD wins the 16 core workstation battle for now.
Anyways… The Tyan S4980 sells for around $400. Tyan has a good reputation, and they have all of the manuals online. Also I can vouch for this motherboard, since I’ve built my 16 core workstation with it.
16 CPUs in Task Manager
Affordable inkjet printing
Posted by Ivan Bohannon in Desktop Printing on February 8th, 2009
You realize how expensive printing is when you have to buy new ink. So I decided to figure out what it costs per page to print in color and black and white.
I assumed that laser printing would be the most cost effective way to print, since the toner cartridges can usually print thousands of pages and cost less than $100.
So lets look at laser printing and see how much one solution actually costs per page. The HP LaserJet P1006 costs about $99 and it prints 17 pages per minute. The replacement toner cartridge is the $68 HP35A (CB435A), and HP says it has a 1500 page yield. So that comes out to costing us 4.5 cents per page ($68 / 1500) . Of course the big catch with this printer is that it can’t print color.
For Color and some nice “All-In-One” features like scanning, fax and photocopying, the HP Photosmart C4480 All-in-One is a good value. Its only $99. If you buy the HP 74XL Inkjets, you can get your per page cost down to 4.6 cents. ($35/ 750)
OEM HP 74 (CB335WN) Black Ink Cartridge $15 for 200 pages. (7.5 cents a page)
OEM HP 74XL (CB336WN) Black Ink Cartridge $35 for 750 pages. (4.6 cents a page).
OEM HP 75 (CB337WN) Color Ink Cartridge $20 for 170 pages (11.7 cents a page)
OEM HP 75XL (CB338WN) Color Ink Cartridge $40 for 520 pages (7.5 cents a page)
Ok so color printing is expensive part, which makes sense because those color cartridges are actually 3 ink tanks in one.
But the great thing about the HP 74/75 cartridges is that you can get them refilled at places like Cartridge World, or you can simply buy them refilled online at your favorite inkjet website.
I was quoted around $20 for a refilled 74XL cartridge at Cartridge World — that brings the price down to 2.6 cents a page.
So let me summarize: Look for a decent HP printer that takes the HP 74/75 cartridges, make sure to buy the large “XL” size cartridges, and you can get your combined average color & bw printing down to about 5 cents a page.
Western Digital MyBook World Edition II 2TB Ethernet External Hard Drive
Posted by Ivan Bohannon in Network Attached Storage on January 25th, 2009
Western Digital MyBook 2TB NAS
This is a great looking product, extremely easy to use, holds a massive amount of files, and its one of the cheapest Network Attached Storage (NAS) products you can buy.
Unfortunately, its performance is TERRIBLE. The average new SATA hard drive in your desktop PC can write files at around 60 MB/s (60 megabytes a second), or a 5GB file in about 2 minutes. The MyBook World Edition can only write files at around 5 MB/s so that same 5GB file would take 17 minutes. I don’t understand why this product would be more than 10 times slower than a regular hard drive. Heck the Buffalo 1TB external USB hard drive I reviewed last month writes files at 25 MB/s – five times faster than the MyBook.
The MyBook has a Gigabit Ethernet port, which has a max rate of 125 MB/s, it also has TWO internal hard drives, that we know should be able to do 60 MB/s (assuming they are SATA drives, which they probably are). So WHY is this drive so dang slow?
I checked to see if I could reformat the hard drive to make it RAID 0 striped, hoping to improve the performance. Unfortunately the MyBook only offers Raid 1 (redundant data) or drive spanning. So ultimately, because of the bad performance this product is unacceptable. I’m planning on continuing my investigations into NAS products to see if I can find something that actually comes close to maxing out Gigabit Ethernet. I know nothing on the box said “Its really fast!” but I can’t help but feel a little misled.
AT&T did not deliver
Posted by Ivan Bohannon in Ivan's Tech Talk on January 19th, 2009
4 weeks ago, I orderd AT&T DSL after I received a flyer promising a $200 gift card, A free 2-wire wireless home gateway, and guaranteed $35 a month fee for 2 years for the “Elite” service. A few days later I got a message saying that my service had been activated, and reminding me to install the DSL hardware. Well I hadn’t received any hardware yet so I waited. And waited. We got the first bill for the service, $35, but still no hardware and no actual DSL service had been used yet. I tried calling AT&T customer service a few times after work, but the Internet service department was always closed.
Today I gave up waiting for a hardware to show up and called them on my day off. After 38 minutes of hold music I finally got to speak with someone in customer service. The first thing they told me was that one screen in there computer said I had received the hardware, and another screen said I hadn’t. Then she said she would get the hardware right out to me. I told her NO THANK YOU! So in two days the DSL service I never got to use will get disconnected.
NETGEAR WNR 3500 RangeMax Wireless-N Gigabit Router
Posted by Ivan Bohannon in Wireless Networking on January 7th, 2009
Netgear WNR 3500
This router is the main ingredient of the fastest wireless performance I have ever seen. A few weeks ago I wrote about getting 70 Mbps with the Trendnet TEW-624UB and this router. Read the rest of this entry »
Comcast Cable Vs AT&T DSL
Posted by Ivan Bohannon in Ivan's Tech Talk on December 24th, 2008
Pretty interesting. the AT&T DSL Elite service which is $35 a month boasts 6 Mbps Download and 768 Kbps Upload. Comcast cable charges $49 a month for this service. This is how fast my Comcast measured at 9:30 AM on Christmas Eve.
