ISIF recently launched a rare high-bandwidth optimized KR machine, and I was fortunate enough to test it. 
Contents
1. Configuration
2. Evening Peak Return-to-China Speed Tests
3. Return Routes & Network Quality
4. Outbound Routes & TCP Ping
5. International Connectivity
6. IP Quality & Streaming Unlock
7. Performance Tests
8. Summary
1. Configuration
| Plan | 🇰🇷 ISIF KR.GMP-B.8C16G-COM |
|---|---|
| Location | Korea, Seoul |
| CPU | 8 x AMD EPYC 7B13 vCores |
| RAM | 16GB |
| Disk | 120GB |
| Traffic | 5TB(two-way billing) |
| Peak Bandwidth | 1Gbps |
| Return Route | TelecomCN2/Unicom CMIN2/Mobile CMIN2 |
| Outbound Route | TelecomCN2/Unicom10099/Mobile CMIN2 |
| Network | 1 x IPv4, 1 x /56 IPv6 |
| Price | Monthly EUR€96.00/Annual EUR€1008.00 |
The machine is located in Equinix SL1 in Seoul. The IP itself has no usage history and is a native Korean IP, which is also a highlight.
🗒️ Plan List (Discounted Prices)
Click to expand
| Plan | CPU | Memory | Disk | Bandwidth | Traffic | Monthly Price | Annual Price |
|---|---|---|---|---|---|---|---|
| KR.GMP-B.2C4G-COM | 2 cores | 4G | 40G | 200M | 1TB | EUR€ 19.2 | EUR€ 201.6 |
| KR.GMP-B.4C8G-COM | 4 cores | 8G | 80G | 500M | 2TB | EUR€ 38.4 | EUR€ 403.2 |
| KR.GMP-B.8C16G-COM | 8 cores | 16G | 120G | 1000M | 5TB | EUR€ 96 | EUR€ 1008 |
| KR.GMP-B.16C32G-COM | 16 cores | 32G | 160G | 2500M | 10TB | EUR€ 192 | EUR€ 2016 |
Purchase address (no affiliate):https://cloud.isif.net/order/ecs
🔗 Quick Links
| YABS | Node Quality | Mixed Benchmark | nws.sh | Streaming Unlock |
|---|---|---|---|---|
| [Link] | [Link] | [Link] | [Link] | [Link] |
2. Evening Peak Direct Single-Thread Speed Tests
Test Method: single-thread TCP protocol
Speed Test URL: https://speed.cloudflare.com
Latency Check URL: http://www.apple.com/library/test/success.html
China Telecom speeds are still very good in many regions, but possibly because it was under attack, some provinces and cities could not reach speed. China Unicom and China Mobile are basically at the level of premium Japan optimized machines; even though Unicom return uses CMIN2, speed is still good.
Many common latency-check URLs actually use Google CDN, but Google has no local CDN nodes in Korea, so access detours through Japan. Here I use Apple's check URL.
| China Telecom | China Unicom | China Mobile |
|---|---|---|
 |
 |
 |
3. Return Routes & Network Quality
Click to expand
bash <(curl -sL https://run.NodeQuality.com)
Telecom return uses CN2; Unicom and Mobile return use CMIN2.
| IPv4 | IPv6 |
|---|---|
 |
 |
| IPv4 | IPv6 |
|---|---|
 |
 |
4. Outbound Routes & TCP Ping
Click to expand
Three-Network Outbound Routes
Test Site: itdog.cn
Test Time: 2026-01-29 23:00
Telecom outbound uses CN2 and is currently waiting for whitelist approval; Unicom outbound uses 4837->10099, and Mobile outbound uses CMIN2.
| Location | China Telecom | China Unicom | China Mobile |
|---|---|---|---|
| Beijing |  |
 |
 |
| Shanghai |  |
 |
 |
| Guangzhou |  |
 |
 |
Three-Network TCP Ping
Test Site: itdog.cn
Test Time: 2026-01-29 23:00
China Telecom and China Mobile are relatively stable.
Some China Unicom provinces and cities have packet loss and jitter, with relatively high latency.
| China Telecom | China Unicom | China Mobile |
|---|---|---|
 |
 |
 |
5. International Connectivity
Click to expand
Web Latency
bash <(wget -qO- https://raw.githubusercontent.com/danger-dream/network-latency-tester/main/latency.sh)
Looking at web latency, Google and Microsoft sites route through Japan, probably because many websites have no CDN nodes in Korea but do have them in Japan.
bgp.tools
Test Site: bgp.tools
Test Time: 2026-01-30 00:00
| IPv4 | IPv6 |
|---|---|
 |
 |
Own-node Speed & Latency Tests
Test Method: iPerf3 TCP single-thread & one 10-second run
Test Time: 2026-01-29 19:00
It can reach Hong Kong Sakura in 35 ms and Tokyo Sakura in 32 ms, which is excellent.
For speed, local can be saturated. IPv4 to Japan nodes is somewhat low, while IPv6 is more normal (Korea-Japan capacity will be expanded later). IPv4 to Hong Kong Sakura and Hytron can saturate, and IPv6 can basically saturate everywhere.
- IPv4
| iPerf3 | Ping |
|---|---|
 |
 |
- IPv6
| iPerf3 | Ping |
|---|---|
 |
 |
6. IP Quality & Streaming Unlock
Click to expand
bash <(curl -sL https://run.NodeQuality.com)
Native Korean IP, not dual-ISP. Local and cross-country streaming unlock is good, though Google geolocates it to Hong Kong.
| IPv4 | IPv6 |
|---|---|
 |
 |
bash <(curl -L -s check.unlock.media)
| IPv4 | IPv6 |
|---|---|
 |
 |
7. Performance Tests
Click to expand
bash <(curl -sL https://Check.Place) -H
CPU performance is strong, and I/O is acceptable.
8. Summary
This is a powerful VPS and is more suitable for website hosting and similar business use. Although the price is high, Korean bandwidth is also very expensive, and this kind of route is scarce while performing at an excellent level. The KR.GMP-B.8C16G-COM tested here is suitable for users with real business needs and production workloads, not very suitable for personal daily proxy use. Budget-conscious individual users can choose the entry-level 200M model. Also, many websites do not have Korean CDN nodes and need to route through Japan; if that matters, consider split routing. Telecom outbound 4809 is still waiting for whitelist approval, so patience is needed.
9. About the Tests
Click to expand
"ISIF KR.GMP-B.8C16G-COM" was provided by the provider; the other machines used in this test were purchased at my own expense. Results may be time-sensitive.
Kernel parameters of the test machines (/etc/sysctl.conf) are as follows:
fs.file-max = 6815744
net.ipv4.tcp_no_metrics_save=1
net.ipv4.tcp_ecn=0
net.ipv4.tcp_frto=0
net.ipv4.tcp_mtu_probing=0
net.ipv4.tcp_rfc1337=0
net.ipv4.tcp_sack=1
net.ipv4.tcp_fack=1
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_adv_win_scale=1
net.ipv4.tcp_moderate_rcvbuf=1
net.core.rmem_max=33554432
net.core.wmem_max=33554432
net.ipv4.tcp_rmem=4096 87380 33554432
net.ipv4.tcp_wmem=4096 16384 33554432
net.ipv4.udp_rmem_min=8192
net.ipv4.udp_wmem_min=8192
net.ipv4.ip_forward=1
net.ipv4.conf.all.route_localnet=1
net.ipv4.conf.all.forwarding=1
net.ipv4.conf.default.forwarding=1
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr
net.ipv6.conf.all.forwarding=1
net.ipv6.conf.default.forwarding=1
10. Acknowledgements
Click to expand
Thanks to "Impart Speed Test“(@Kyoma ) for proproviding the mainland China public-interest speed test service; thanks to itdog.cn for providing the free distributed probing service.