SIM5300E 3G module Development Board Quad-band GSM GPRS GPS SMS with PCB Antenna
Dual-Band WCDMA/HSPA 900/2100MHz
Dual-Band GSM/GPRS/EDGE 900/1800MHz
GPRS multi-slot class 12 sim5300
EDGE downlink only
- UMTS 900/2100:0.25W
Control Via AT Commands
Supply voltage range:3.4V~ 4.4V
Operation temperature:-40° to +85°
- Max.7.2Mbps(DL), Max.5.76Mbps(UL) sim5300
- Max.384Kbps(DL), Max.384Kbps(UL)
- Max.85.6Kbps(DL), Max.85.6Kbps(UL)
MSI MAG B550 Tomahawk
With the dawn of the latest in-the-middle chipsets—AMD’s B550 and Intel’s H470 and B460—midrange desktop motherboards just keep getting better. That arguably goes without saying, but in this generation we’re seeing more pronounced improvements.
Case in point: MSI’s MAG B550 Tomahawk ($179.99), which might be mistaken at a glance for a premium ATX pick. And the similarities go deeper than just appearances—with PCI Express 4.0 support, a 2.5Gbps NIC, and two 10Gbps USB 3.2 Gen 2 ports on the back panel, this board has a modern feature set that’s comparable to what we have seen on many AMD X570 and Intel Z490 motherboards.
This makes the Tomahawk a hard option to pass up in the midrange market, and our latest Editors’ Choice winner among mainstream Ryzen desktop boards.
sim5300 opted to color the MAG B550 Tomahawk in a mixture of black and gray. Black is the more prominent color, but there’s a good amount of gray that adds contrast and keeps the board from looking too dull. MSI also put some RGB LEDs around the chipset heatsink that add some much-needed color to the board when it’s powered up.
The chipset heatsink itself is average-size for a midrange motherboard, and smaller than you would expect to see on a high-end board. MSI configured this board with 10 digital power phases for the CPU, and three additional phases for other components. These are cooled by two relatively large heatsinks and should work well enough for everyday use and a bit of overclocking.
This board also has a rear I/O shroud and a permanently attached rear I/O plate, which makes installing the board in a case a bit easier. I don’t always mention this aspect of boards because most upper-end boards I review nowadays have shrouds and plates. But midrange and low-end boards usually don’t, so it’s worth noting.
Two M.2 slots (down by the PCI Express slots) are covered over by heat spreaders. The uppermost M.2 port is set above the primary PCI Express x16 slot, and there is room here to install M.2 drives in the long Type-22110 (110mm) form factor. This slot also runs off the CPU’s PCIe controller and can operate using either PCIe 4.0 lanes or 3.0 lanes. It also supports SATA M.2 SSDs.
The lower M.2 port connects to the board’s chipset and is therefore locked into using PCIe 3.0 lanes; it supports PCI Express M.2 SSDs only. This slot is also in a more cramped location and can only accept drives measuring 80mm or shorter. I wouldn’t consider this a drawback, however, as few M.2 solid-state drives nowadays use the longer 110mm form factor, and PCIe 4.0 support isn’t so ubiquitous that every slot needs it. (See our favorite M.2 SSDs we’ve tested.)
Networking, Audio, and Rear I/O
The MAG B550 Tomahawk doesn’t sport a built-in Wi-Fi chip (likely due to cost reduction), but it does have two LAN controllers. (Serious gamers, for one, are going to opt for Ethernet anyway.) The main networking controller is a Realtek RTL8125B chip that supports internet speeds up to 2.5Gbps.
This sim5300 is becoming a regular collaborator on modern midrange and high-end boards, and it offers a significant step up in terms of performance over aging 1Gbps solutions. The second networking controller is one of those aging 1Gbps solutions I just mentioned—a Realtek RTL8111H. It can’t compare with the RTL8125B chip, but it’s a sensible option for a low-cost secondary NIC.
MSI chose a Realtek ALC1200 codec to drive the audio to the 3.5mm jacks on both the front and back panels. Information on this chip is scarce, but it appears to be a budget variant of Realtek’s more widely used ALC1220. Most users probably won’t be able to tell the difference between the two audio chips, so it should work fine for casual use.
The B550 Tomahawk’s rear I/O panel could use a few more USB ports, but it’s not bad for a midrange loadout. You get a total of six USB ports on the back panel, including one USB 3.2 Gen 2 Type-A and one USB 3.2 Gen 2 Type-C, both supporting 10Gbps peak throughput.
Two of the remaining ports are also USB 3.2, but these are of the slower Gen 1 5Gbps variety. The last two ports on the back panel are legacy USB 2.0 ports best reserved for mice and keyboards, and beside these is a PS/2 jack for antique peripherals.
Alongside the USB ports are two RJ-45 jacks for the wired NICs mentioned earlier, and five 3.5mm jacks plus an S/PDIF port for audio. Video connections on the board include one HDMI port and one DisplayPort connection, if you opt for a late-model Ryzen G series chip with integrated Radeon graphics.
The rear I/O panel also has a button that can be used to flash the BIOS to a new version, which is a useful function to have, especially if you need a BIOS update to make the board support a newer processor. (It’s important to note that the B550 chipset does not support first-gen and second-gen Ryzen AM4 chips. The only chips supported are the Ryzen 3000 and 5000 series.)
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