diff --git a/ci/slab.toml b/ci/slab.toml
index b206d62..05bc3a0 100644
--- a/ci/slab.toml
+++ b/ci/slab.toml
@@ -2,13 +2,49 @@
 region = "eu-west-3"
 image_id = "ami-05e8e219ac7e82eba" # ubuntu 22.04
 instance_type = "t3.micro"
+#instance_type = "m6g.large"
 subnet_id = "subnet-0e042c7621461f754"
 
+# Handling backends
+[backend.aws.cpu]
+region = "eu-west-3"
+image_id = "ami-05e8e219ac7e82eba" # ubuntu 22.04
+#image_id = "ami-00232bbfe70330a10" # ubuntu 22.04 ARM64
+instance_type = "t3.xlarge"
+#instance_type = "t4g.medium" # ARM machine
+#instance_type = "t345.xlarge" # Non existing instance type
+
+[backend.aws.cpu_fallback]
+region = "eu-west-3"
+image_id = "ami-05e8e219ac7e82eba" # ubuntu 22.04
+instance_type = "t3.xlarge"
+
+[profile.cpu_fallback]
+region = "us-east-1"
+image_id = "ami-0c4773f5626d919b6"
+instance_type = "p3.2xlarge"
+
+#[backend.hyperstack.gpu]
+#environment_name = "norway"
+#image_name = "Ubuntu Server 22.04 LTS R535 CUDA 12.2"
+#flavor_name = "n1-cpu-small"
+
+[backend.hyperstack.gpu]
+environment_name = "canada"
+image_name = "Ubuntu Server 22.04 LTS R535 CUDA 12.2"
+flavor_name = "m"
+
 [profile.gpu]
 region = "eu-west-1"  # Ireland
 image_id = "ami-0261faf04cf54fe0a"  # GPU image in eu-west-1 to test auto retry
 instance_type = "p3.2xlarge"
 
+[profile.gpu-bench]
+region = "us-west-2"
+image_id = "ami-02ae9b9b4fffdf66f"
+instance_type = "p5.48xlarge"
+max_spot_price = "200.49"
+
 [command.cpu_test]
 workflow = "main.yml"
 profile = "cpu"
@@ -18,6 +54,6 @@ check_run_name = "AWS tests (Slab)"
 
 [command.gpu_test]
 workflow = "main.yml"
-profile = "gpu"
+profile = "gpu-bench"
 check_run_name = "AWS tests spawn GPU (Slab)"