diff --git a/aula-08/main.tf b/aula-08/main.tf
index f54297b..c097cc8 100644
--- a/aula-08/main.tf
+++ b/aula-08/main.tf
@@ -38,6 +38,19 @@ locals {
   # Endpoint: LoadBalancer IP if enabled, otherwise Floating IP
   cluster_endpoint_ip = var.enable_loadbalancer ? hcloud_load_balancer.cluster[0].ipv4 : hcloud_floating_ip.control_plane[0].ip_address
 
+  # Arquitetura: mapeia arm64→CAX (Nuremberg) ou amd64→CPX (Frankfurt)
+  arch_config = {
+    arm64 = {
+      server_type_cp = "cax11"
+      location       = "nbg1"
+    }
+    amd64 = {
+      server_type_cp = "cpx21"
+      location       = "fsn1"
+    }
+  }
+  selected_arch = local.arch_config[var.arch]
+
   common_labels = {
     cluster     = local.cluster_name
     environment = var.environment
@@ -192,15 +205,15 @@ resource "hcloud_placement_group" "cluster" {
 }
 
 ############################################################
-# CONTROL PLANE NODES (HA with 3 CAX11 nodes)
+# CONTROL PLANE NODES (HA com 3 nodes)
 ############################################################
 
 resource "hcloud_server" "control_plane" {
   count       = local.control_plane_count
   name        = "${local.cluster_name}-cp-${count.index}"
-  server_type = "cax11"
+  server_type = local.selected_arch.server_type_cp
   image       = data.hcloud_image.talos.id
-  location    = "nbg1"  # CAX11 only available in Nuremberg
+  location    = local.selected_arch.location
   ssh_keys    = [local.ssh_key_id]
 
   firewall_ids       = [hcloud_firewall.cluster.id]
@@ -209,7 +222,7 @@ resource "hcloud_server" "control_plane" {
   labels = merge(local.common_labels, {
     role = "control-plane"
     node = "cp-${count.index}"
-    arch = "arm64"
+    arch = var.arch
   })
 
   public_net {
@@ -373,15 +386,15 @@ resource "hcloud_load_balancer_target" "worker" {
 }
 
 ############################################################
-# WORKER NODE (Single CAX11)
+# WORKER NODE
 ############################################################
 
 resource "hcloud_server" "worker" {
   count       = 1
   name        = "${local.cluster_name}-worker-${count.index}"
-  server_type = "cax11"
+  server_type = local.selected_arch.server_type_cp
   image       = data.hcloud_image.talos.id
-  location    = "nbg1"
+  location    = local.selected_arch.location
   ssh_keys    = [local.ssh_key_id]
 
   firewall_ids       = [hcloud_firewall.cluster.id]
@@ -390,7 +403,7 @@ resource "hcloud_server" "worker" {
   labels = merge(local.common_labels, {
     role = "worker"
     node = "worker-${count.index}"
-    arch = "arm64"
+    arch = var.arch
   })
 
   public_net {
diff --git a/aula-08/setup.sh b/aula-08/setup.sh
index ff752e3..809e8fd 100755
--- a/aula-08/setup.sh
+++ b/aula-08/setup.sh
@@ -18,6 +18,9 @@ NC='\033[0m' # No Color
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 cd "$SCRIPT_DIR"
 
+# Variáveis com defaults
+ARCH="${ARCH:-arm64}"
+
 # Funções de log
 log_info() {
     echo -e "${BLUE}[INFO]${NC} $1"
@@ -47,18 +50,23 @@ echo ""
 
 log_info "Verificando pré-requisitos..."
 
-# Verificar OpenTofu
-if ! command -v tofu &> /dev/null; then
-    log_error "OpenTofu não encontrado!"
+# Detectar OpenTofu ou Terraform
+if command -v tofu &> /dev/null; then
+    TF_CMD="tofu"
+    log_success "OpenTofu $(tofu version | head -1)"
+elif command -v terraform &> /dev/null; then
+    TF_CMD="terraform"
+    log_success "Terraform $(terraform version | head -1)"
+else
+    log_error "OpenTofu ou Terraform não encontrado!"
     echo ""
-    echo "Instale o OpenTofu:"
-    echo "  brew install opentofu     # macOS"
-    echo "  snap install opentofu     # Linux"
+    echo "Instale um deles:"
+    echo "  brew install opentofu       # OpenTofu (recomendado)"
+    echo "  brew install terraform      # Terraform"
     echo ""
     echo "Mais info: https://opentofu.org/docs/intro/install/"
     exit 1
 fi
-log_success "OpenTofu $(tofu version | head -1)"
 
 # Verificar talosctl
 if ! command -v talosctl &> /dev/null; then
@@ -228,6 +236,23 @@ if [ "$SKIP_CREDENTIALS" != "true" ]; then
     fi
     echo ""
 
+    # Arquitetura
+    echo "6. Arquitetura dos nodes"
+    echo ""
+    echo "   arm64 (CAX) - Ampere Altra, melhor custo/benefício"
+    echo "   amd64 (CPX) - AMD EPYC, mais disponível"
+    echo ""
+    read -p "   Arquitetura? (arm64/amd64) [arm64]: " arch_input
+    ARCH="${arch_input:-arm64}"
+
+    if [[ "$ARCH" == "amd64" ]]; then
+        log_success "AMD64 selecionado (CPX em fsn1)"
+    else
+        log_success "ARM64 selecionado (CAX em nbg1)"
+        ARCH="arm64"
+    fi
+    echo ""
+
     # Criar terraform.tfvars
     log_info "Criando terraform.tfvars..."
     cat > terraform.tfvars << EOF
@@ -241,6 +266,7 @@ talos_image_id = $TALOS_IMAGE_ID
 environment         = "prod"
 enable_ha           = $ENABLE_HA
 enable_loadbalancer = $ENABLE_LB
+arch                = "$ARCH"
 EOF
     log_success "terraform.tfvars criado"
 fi
@@ -256,8 +282,8 @@ echo "  Inicializando OpenTofu"
 echo "============================================"
 echo ""
 
-log_info "Executando tofu init..."
-tofu init
+log_info "Executando $TF_CMD init..."
+$TF_CMD init
 
 log_success "OpenTofu inicializado"
 echo ""
@@ -271,8 +297,8 @@ echo "  Planejando Infraestrutura"
 echo "============================================"
 echo ""
 
-log_info "Executando tofu plan..."
-tofu plan -out=tfplan
+log_info "Executando $TF_CMD plan..."
+$TF_CMD plan -out=tfplan
 
 echo ""
 log_success "Plano criado!"
@@ -322,7 +348,7 @@ if [[ ! "$apply" =~ ^[Ss]$ ]]; then
     log_warn "Operação cancelada pelo usuário"
     echo ""
     echo "Para aplicar manualmente:"
-    echo "  tofu apply tfplan"
+    echo "  $TF_CMD apply tfplan"
     echo ""
     exit 0
 fi
@@ -331,7 +357,7 @@ echo ""
 log_info "Aplicando infraestrutura..."
 echo ""
 
-tofu apply tfplan
+$TF_CMD apply tfplan
 
 echo ""
 log_success "Infraestrutura provisionada!"
@@ -356,7 +382,7 @@ if [ -f "talosconfig" ]; then
     export TALOSCONFIG="$SCRIPT_DIR/talosconfig"
 
     # Obter IP do control plane
-    CP_IP=$(tofu output -raw control_plane_ip 2>/dev/null || echo "")
+    CP_IP=$($TF_CMD output -raw control_plane_ip 2>/dev/null || echo "")
 
     if [ -n "$CP_IP" ]; then
         log_info "Aguardando API do Talos em $CP_IP..."
@@ -405,7 +431,7 @@ echo ""
 
 # Obter token do terraform.tfvars
 HCLOUD_TOKEN=$(grep 'hcloud_token' terraform.tfvars | cut -d'"' -f2)
-NETWORK_ID=$(tofu output -raw network_id 2>/dev/null || echo "")
+NETWORK_ID=$($TF_CMD output -raw network_id 2>/dev/null || echo "")
 
 if [ -z "$HCLOUD_TOKEN" ]; then
     log_error "Não foi possível obter HCLOUD_TOKEN!"
@@ -469,11 +495,11 @@ echo ""
 # Obter configurações do OpenTofu
 log_info "Obtendo configurações do OpenTofu..."
 
-WORKER_CONFIG_BASE64=$(tofu output -raw autoscaler_worker_config 2>/dev/null)
-TALOS_IMAGE_ID=$(tofu output -raw autoscaler_image_id 2>/dev/null)
-CLUSTER_NAME=$(tofu output -raw cluster_name 2>/dev/null)
-FIREWALL_ID=$(tofu output -raw firewall_id 2>/dev/null)
-SSH_KEY_NAME=$(tofu output -raw ssh_key_name 2>/dev/null)
+WORKER_CONFIG_BASE64=$($TF_CMD output -raw autoscaler_worker_config 2>/dev/null)
+TALOS_IMAGE_ID=$($TF_CMD output -raw autoscaler_image_id 2>/dev/null)
+CLUSTER_NAME=$($TF_CMD output -raw cluster_name 2>/dev/null)
+FIREWALL_ID=$($TF_CMD output -raw firewall_id 2>/dev/null)
+SSH_KEY_NAME=$($TF_CMD output -raw ssh_key_name 2>/dev/null)
 
 if [ -z "$WORKER_CONFIG_BASE64" ]; then
     log_error "Não foi possível obter configuração do worker!"
@@ -495,7 +521,7 @@ kubectl label namespace cluster-autoscaler pod-security.kubernetes.io/enforce=pr
 CLUSTER_CONFIG_JSON=$(cat <<CCEOF
 {
   "imagesForArch": {
-    "arm64": "$TALOS_IMAGE_ID"
+    "$ARCH": "$TALOS_IMAGE_ID"
   },
   "nodeConfigs": {
     "worker-pool": {
@@ -536,12 +562,25 @@ log_success "Secret criado"
 
 # Aplicar manifesto
 log_info "Aplicando manifesto do cluster-autoscaler..."
-cat cluster-autoscaler.yaml | \
-    sed "s|\${TALOS_IMAGE_ID}|$TALOS_IMAGE_ID|g" | \
-    sed "s|\${NETWORK_NAME}|$CLUSTER_NAME-network|g" | \
-    sed "s|\${FIREWALL_NAME}|$CLUSTER_NAME-firewall|g" | \
-    sed "s|\${SSH_KEY_NAME}|$SSH_KEY_NAME|g" | \
-    kubectl apply -f -
+# Ajustar server_types do autoscaler conforme arquitetura
+if [[ "$ARCH" == "amd64" ]]; then
+    AUTOSCALER_FILE="${SCRIPT_DIR}/cluster-autoscaler.yaml"
+    # CPX equivalentes: CAX21→CPX31, CAX31→CPX41, CAX11→CPX21
+    cat "$AUTOSCALER_FILE" | \
+        sed "s|\${TALOS_IMAGE_ID}|$TALOS_IMAGE_ID|g" | \
+        sed "s|\${NETWORK_NAME}|$CLUSTER_NAME-network|g" | \
+        sed "s|\${FIREWALL_NAME}|$CLUSTER_NAME-firewall|g" | \
+        sed "s|\${SSH_KEY_NAME}|$SSH_KEY_NAME|g" | \
+        sed -e 's/CAX21/CPX31/g' -e 's/CAX31/CPX41/g' -e 's/CAX11/CPX21/g' | \
+        kubectl apply -f -
+else
+    cat cluster-autoscaler.yaml | \
+        sed "s|\${TALOS_IMAGE_ID}|$TALOS_IMAGE_ID|g" | \
+        sed "s|\${NETWORK_NAME}|$CLUSTER_NAME-network|g" | \
+        sed "s|\${FIREWALL_NAME}|$CLUSTER_NAME-firewall|g" | \
+        sed "s|\${SSH_KEY_NAME}|$SSH_KEY_NAME|g" | \
+        kubectl apply -f -
+fi
 
 # Aguardar pod ficar pronto
 log_info "Aguardando pod do autoscaler..."
@@ -641,8 +680,8 @@ echo ""
 
 # Mostrar outputs
 echo "Endpoints:"
-tofu output -raw kubernetes_api_endpoint 2>/dev/null && echo "" || true
-tofu output -raw talos_api_endpoint 2>/dev/null && echo "" || true
+$TF_CMD output -raw kubernetes_api_endpoint 2>/dev/null && echo "" || true
+$TF_CMD output -raw talos_api_endpoint 2>/dev/null && echo "" || true
 echo ""
 
 echo "Componentes instalados:"
@@ -651,6 +690,9 @@ echo "  - Cluster Autoscaler (1-5 workers)"
 echo "  - Hetzner CSI Driver (StorageClass: hcloud-volumes)"
 echo "  - NGINX Ingress Controller + LoadBalancer"
 echo ""
+echo "Configuração:"
+echo "  - Arquitetura: $ARCH"
+echo ""
 
 # Mostrar IP do LoadBalancer
 LB_IP=$(kubectl get svc -n ingress-nginx ingress-nginx-controller \
diff --git a/aula-08/terraform.tfvars.example b/aula-08/terraform.tfvars.example
index 5a18add..eb73c1d 100644
--- a/aula-08/terraform.tfvars.example
+++ b/aula-08/terraform.tfvars.example
@@ -24,6 +24,11 @@ talos_image_id = 123456789
 # Ambiente (prod, staging, dev)
 environment = "workshop"
 
+# Arquitetura dos nodes: arm64 (CAX) ou amd64 (CPX)
+# arm64 = CAX11/21/31 em Nuremberg (nbg1) - melhor custo
+# amd64 = CPX21/31/41 em Frankfurt (fsn1) - mais disponível
+# arch = "arm64"
+
 # Versão do Talos OS (opcional - default: v1.11.2)
 # talos_version = "v1.11.2"
 
diff --git a/aula-08/variables.tf b/aula-08/variables.tf
index 64c9b16..2f5a4e5 100644
--- a/aula-08/variables.tf
+++ b/aula-08/variables.tf
@@ -68,6 +68,21 @@ variable "talos_version" {
   }
 }
 
+# ==========================================================
+# ARQUITETURA
+# ==========================================================
+
+variable "arch" {
+  type        = string
+  description = "Arquitetura dos nodes: arm64 (CAX - Ampere Altra, melhor custo) ou amd64 (CPX - AMD EPYC, mais disponível)"
+  default     = "arm64"
+
+  validation {
+    condition     = contains(["arm64", "amd64"], var.arch)
+    error_message = "arch deve ser arm64 ou amd64."
+  }
+}
+
 # ==========================================================
 # LABELS CUSTOMIZADAS
 # ==========================================================